Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details)

v2.4.1.9
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended
Mar. 13, 2014
Dec. 27, 2014
Dec. 27, 2014
Dec. 28, 2013
Mar. 14, 2014
Dec. 27, 2014
Jun. 17, 2014
Mar. 29, 2014
Sep. 27, 2014
Jun. 16, 2014
Jun. 15, 2014
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Debt Instrument, Term 3 years                    
Proceeds from Issuance of Debt     $ 500,000us-gaap_ProceedsFromIssuanceOfDebt                
Line of Credit Facility, Remaining Borrowing Capacity   0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity 0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity     0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity   0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity      
Repayments of Debt     99,000us-gaap_RepaymentsOfDebt                
Repayments of Lines of Credit     7,668,000us-gaap_RepaymentsOfLinesOfCredit 40,000us-gaap_RepaymentsOfLinesOfCredit              
Accretion Expense   19,000us-gaap_AccretionExpense                  
Proceeds from Lines of Credit     8,125,000us-gaap_ProceedsFromLinesOfCredit 136,000us-gaap_ProceedsFromLinesOfCredit              
Common Stock [Member] | Under First Draw [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Class of Warrant or Right, Outstanding (in Shares)         180,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
undefined         155,000giga_ClassOfWarrantOrRightOutstandingAdjustment
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Class of Warrant or Right, Exchanged for Cash, Amount         150,000giga_ClassOfWarrantOrRightExchangedForCashAmount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Common Stock [Member] | Amendment [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Class of Warrant or Right, Outstanding (in Shares)         80,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Class of Warrant or Right, Exchanged for Cash, Amount         67,000giga_ClassOfWarrantOrRightExchangedForCashAmount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Common Stock [Member] | If Final Draw Occurs [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Class of Warrant or Right, Outstanding (in Shares)         40,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_IfFinalDrawOccursMember
           
undefined         27,500giga_ClassOfWarrantOrRightOutstandingAdjustment
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_IfFinalDrawOccursMember
           
Class of Warrant or Right, Exchanged for Cash, Amount         33,000giga_ClassOfWarrantOrRightExchangedForCashAmount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= giga_IfFinalDrawOccursMember
           
Common Stock [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)         300,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Class of Warrant or Right, Term         5 years            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)         $ 1.42us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Class of Warrant or Right, Exercisable, Adjustment, Net Sales         18,000,000giga_ClassOfWarrantOrRightExercisableAdjustmentNetSales
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Class of Warrant or Right, Exercisable, Adjustment, Net Income         1,000,000giga_ClassOfWarrantOrRightExercisableAdjustmentNetIncome
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Amendment [Member] | Under Second Draw [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
undefined         67,500giga_ClassOfWarrantOrRightOutstandingAdjustment
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementEquityComponentsAxis
= giga_AmendmentMember
/ us-gaap_StatementScenarioAxis
= giga_UnderSecondDrawMember
           
Achievement of Performance Milestones First Half of Fiscal 2015 [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Line of Credit Facility, Remaining Borrowing Capacity         1,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_AchievementOfPerformanceMilestonesFirstHalfOfFiscal2015Member
           
Debt Instrument Performance Milestone Net Sales 7,500,000giga_DebtInstrumentPerformanceMilestoneNetSales
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_AchievementOfPerformanceMilestonesFirstHalfOfFiscal2015Member
                   
Under First Draw [Member] | PFG Loan [Member] | Prepaid Expenses and Other Current Assets [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Debt Issuance Cost         30,000us-gaap_DebtIssuanceCosts
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Under First Draw [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Long-term Debt, Gross         822,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Debt Instrument, Convertible, Beneficial Conversion Feature         128,000us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Debt Instrument, Unamortized Discount         178,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Under First Draw [Member] | Warrant Debt [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Long-term Debt, Gross         178,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Debt Instrument, Convertible, Beneficial Conversion Feature         50,000us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Derivative Liability, Fair Value, Gross Liability   165,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
165,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
    165,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
    235,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
   
Debt Instrument, Unamortized Discount         100,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
           
Under First Draw [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Accretion Expense   26,000us-gaap_AccretionExpense
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
59,000us-gaap_AccretionExpense
/ us-gaap_StatementScenarioAxis
= giga_UnderFirstDrawMember
               
Amendment [Member] | PFG Loan [Member] | Prepaid Expenses and Other Current Assets [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Debt Issuance Cost         15,000us-gaap_DebtIssuanceCosts
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Amendment [Member] | PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Long-term Debt, Gross         365,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Debt Instrument, Convertible, Beneficial Conversion Feature         123,000us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Debt Instrument, Unamortized Discount         135,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Amendment [Member] | Warrant Debt [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Long-term Debt, Gross         135,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Debt Instrument, Convertible, Beneficial Conversion Feature         12,000us-gaap_DebtInstrumentConvertibleBeneficialConversionFeature
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Derivative Liability, Fair Value, Gross Liability   70,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
70,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
    70,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
    106,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
   
Debt Instrument, Unamortized Discount         55,000us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
           
Accretion Expense     56,000us-gaap_AccretionExpense
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
/ us-gaap_StatementScenarioAxis
= giga_AmendmentMember
               
If Final Draw Occurs [Member] | PFG Loan [Member] | Prepaid Expenses and Other Current Assets [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Debt Issuance Cost         5,000us-gaap_DebtIssuanceCosts
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_StatementScenarioAxis
= giga_IfFinalDrawOccursMember
           
PFG Loan [Member] | Revolving Credit Facility [Member] | Partners For Growth IV, L.P. [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Line of Credit Facility, Remaining Borrowing Capacity                   500,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
1,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
PFG Loan [Member] | Secured Debt [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Long-term Debt, Gross   1,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
1,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
    1,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
         
PFG Loan [Member] | Minimum [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Debt Instrument Performance Milestones Net Income   0giga_DebtInstrumentPerformanceMilestonesNetIncome
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
                 
PFG Loan [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Debt Instrument, Term 3 years                    
Debt Instrument, Face Amount 2,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
                   
Proceeds from Issuance of Debt 1,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
      1,000,000us-gaap_ProceedsFromIssuanceOfDebt
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
           
Debt Instrument, Interest Rate, Stated Percentage   9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
    9.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
         
Fair Value Adjustment of Warrants   (107,000)us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
      16,000us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_DebtInstrumentAxis
= giga_PFGLoanMember
         
Warrant Debt [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Derivative Liability, Fair Value, Gross Liability   235,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
235,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
    235,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
    341,000us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DebtInstrumentAxis
= giga_WarrantDebtMember
   
Revolving Credit Facility [Member] | Partners For Growth IV, L.P. [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity                   500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
 
Debt Instrument, Interest Rate, Stated Percentage   12.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
12.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
    12.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
         
Repayments of Lines of Credit   0us-gaap_RepaymentsOfLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
                 
Proceeds from Lines of Credit         500,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
  500,000us-gaap_ProceedsFromLinesOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
       
Partners For Growth IV, L.P. [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Repayments of Debt   99,000us-gaap_RepaymentsOfDebt
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
                 
Long-term Debt   1,400,000us-gaap_LongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
1,400,000us-gaap_LongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
    1,400,000us-gaap_LongTermDebt
/ us-gaap_LineOfCreditFacilityAxis
= giga_PartnersForGrowthIVLPMember
         
Silicon Valley Bank [Member]                      
Note 14 - Term Loan, Revolving Line of Credit and Warrants (Details) [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity   $ 3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= giga_SiliconValleyBankMember
$ 3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= giga_SiliconValleyBankMember
    $ 3,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= giga_SiliconValleyBankMember