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Debt Obligations - Principal Repayments Due Under Term Loan (Details) (USD $)
Mar. 31, 2015
Debt Instrument [Line Items]  
Less discount $ (709,822)us-gaap_DebtInstrumentUnamortizedDiscount
Term Loan  
Debt Instrument [Line Items]  
2015 813,715us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
2016 3,432,771us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
2017 3,736,197us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
2018 3,017,317us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
Total Growth Term Loan payments 11,000,000us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
Less discount (500,311)us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
Plus final fee premium 80,438us-gaap_DebtInstrumentUnamortizedPremium
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember
Total Growth Term Loan, net $ 10,580,127us-gaap_LongTermDebt
/ us-gaap_CreditFacilityAxis
= htgm_TermLoanMember