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Debt Obligations - Summary of Convertible Notes Issued (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Debt Instrument [Line Items]  
Convertible note draws $ 3,000,000us-gaap_ConvertibleNotesPayableCurrent
Less discount (709,822)us-gaap_DebtInstrumentUnamortizedDiscount
Total convertible notes, net 2,290,178htgm_ConvertibleNotesCurrentLessDiscount
Convertible Note One  
Debt Instrument [Line Items]  
Date Issued Feb. 25, 2015
Maturity Date Mar. 31, 2016
Convertible note draws 1,500,000us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_LongtermDebtTypeAxis
= htgm_ConvertibleNoteOneMember
Convertible Note Two  
Debt Instrument [Line Items]  
Date Issued Mar. 25, 2015
Maturity Date Mar. 31, 2016
Convertible note draws $ 1,500,000us-gaap_ConvertibleNotesPayableCurrent
/ us-gaap_LongtermDebtTypeAxis
= htgm_ConvertibleNoteTwoMember