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Stock Option Plan - Additional Information (Details) (USD $)
1 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Jan. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Feb. 28, 2014
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Vesting period of options     2 years 4 months 24 days      
Options to purchase common stock outstanding     593,663us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber     595,577us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options fully vested     324,189us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares      
Options Granted 249,361us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 2,094us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross 251,455us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Unrecognized compensation expense     $ 628,473us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Compensation expense related to unvested stock options, period expected to be recognized     3 years      
Employee Stock Option | Two Thousand Eleven Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Common Stock, Capital Shares Reserved for Future Issuance           12,752us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_AwardDateAxis
= htgm_TwoThousandElevenPlanMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
Percentage of increase on outstanding shares         20.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfOutstandingStockMaximum
/ us-gaap_AwardDateAxis
= htgm_TwoThousandElevenPlanMember
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember