Condensed Statements of Operations (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Revenue:
Product	$ 727,438us-gaap_SalesRevenueGoodsNet	$ 370,007us-gaap_SalesRevenueGoodsNet
Service	62,292us-gaap_SalesRevenueServicesNet	214,850us-gaap_SalesRevenueServicesNet
Other	234,585us-gaap_OtherSalesRevenueNet	241,666us-gaap_OtherSalesRevenueNet
Total revenue	1,024,315us-gaap_Revenues	826,523us-gaap_Revenues
Cost of revenue	894,627us-gaap_CostOfRevenue	642,408us-gaap_CostOfRevenue
Gross margin	129,688us-gaap_GrossProfit	184,115us-gaap_GrossProfit
Operating expenses:
Selling, general and administrative	3,439,269	2,076,801
Research and development	688,214us-gaap_ResearchAndDevelopmentExpense	857,483us-gaap_ResearchAndDevelopmentExpense
Total operating expenses	4,127,483us-gaap_OperatingExpenses	2,934,284us-gaap_OperatingExpenses
Operating loss	(3,997,795)us-gaap_OperatingIncomeLoss	(2,750,169)us-gaap_OperatingIncomeLoss
Income from change in stock warrant valuation	388,960us-gaap_FairValueAdjustmentOfWarrants
Interest expense	(479,299)us-gaap_InterestExpense	(74,507)us-gaap_InterestExpense
Other expense, net		(2,912)us-gaap_OtherNonoperatingIncomeExpense
Net loss before income taxes	(4,088,134)	(2,827,588)
Net loss	(4,088,134)us-gaap_NetIncomeLoss	(2,827,588)us-gaap_NetIncomeLoss
Accretion of stock issuance costs	(24,077)htgm_AccretionOfStockIssuanceCosts	(22,481)htgm_AccretionOfStockIssuanceCosts
Accretion of Series E warrant discount	(87,470)htgm_AccretionOfWarrantDiscount	(51,377)htgm_AccretionOfWarrantDiscount
Accretion of Series D and E redeemable convertible preferred stock dividends	(798,582)	(740,637)
Net loss attributable to common stockholders	(4,998,263)	(3,642,083)
Net loss per share attributable to common stockholders, basic and diluted	$ (14.99)us-gaap_EarningsPerShareBasicAndDiluted	$ (37.80)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing net loss per share attributable to common stockholders, basic and diluted	333,408	96,349
Series E Warrants
Operating expenses:
Accretion of Series E warrant discount	$ (87,470)	$ (51,377)

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