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Condensed Balance Sheets (USD $)
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 1,564,244us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,613,392us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 852,285us-gaap_AccountsReceivableNetCurrent 801,125us-gaap_AccountsReceivableNetCurrent
Inventory, net allowance of $76,194 at March 31, 2015 and $54,269 at December 31, 2014 2,095,486us-gaap_InventoryNet 1,685,814us-gaap_InventoryNet
Prepaid expenses and other 122,149us-gaap_PrepaidExpenseAndOtherAssetsCurrent 112,035us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 4,634,164us-gaap_AssetsCurrent 6,212,366us-gaap_AssetsCurrent
Deferred financing and offering costs 1,742,707us-gaap_DeferredCosts 1,369,281us-gaap_DeferredCosts
Property and equipment:    
Office equipment 417,664htgm_OfficeEquipment 414,424htgm_OfficeEquipment
Leasehold improvements 236,999us-gaap_LeaseholdImprovementsGross 234,602us-gaap_LeaseholdImprovementsGross
Laboratory and manufacturing equipment 2,331,857us-gaap_MachineryAndEquipmentGross 2,009,818us-gaap_MachineryAndEquipmentGross
Field equipment 228,124htgm_FieldEquipment 286,044htgm_FieldEquipment
Software 140,248us-gaap_CapitalizedComputerSoftwareGross 140,248us-gaap_CapitalizedComputerSoftwareGross
Property and equipment, gross 3,354,892us-gaap_PropertyPlantAndEquipmentGross 3,085,136us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization (2,065,424)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (1,938,537)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 1,289,468us-gaap_PropertyPlantAndEquipmentNet 1,146,599us-gaap_PropertyPlantAndEquipmentNet
Total assets 7,666,339us-gaap_Assets 8,728,246us-gaap_Assets
Current liabilities:    
Accounts payable 878,973us-gaap_AccountsPayableCurrent 948,429us-gaap_AccountsPayableCurrent
Accrued liabilities 1,692,892us-gaap_AccruedLiabilitiesCurrent 1,499,750us-gaap_AccruedLiabilitiesCurrent
Deferred revenue 32,015us-gaap_DeferredRevenueCurrent 41,248us-gaap_DeferredRevenueCurrent
Term loan 1,644,845us-gaap_LoansPayableCurrent 813,715us-gaap_LoansPayableCurrent
Convertible notes, less discount 2,290,178htgm_ConvertibleNotesCurrentLessDiscount  
Total current liabilities 6,538,903us-gaap_LiabilitiesCurrent 3,303,142us-gaap_LiabilitiesCurrent
Redeemable convertible preferred stock warrant liability 1,079,295htgm_RedeemableConvertiblePreferredStockWarrantLiability 730,543htgm_RedeemableConvertiblePreferredStockWarrantLiability
Term loan payable - non-current, net of discount 8,935,282us-gaap_LongTermLoansPayable 9,705,655us-gaap_LongTermLoansPayable
NuvoGen obligation - non-current 8,804,425us-gaap_AssetRetirementObligationsNoncurrent 8,677,859us-gaap_AssetRetirementObligationsNoncurrent
Other 51,069us-gaap_OtherLiabilitiesNoncurrent 58,380us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 25,408,974us-gaap_Liabilities 22,475,579us-gaap_Liabilities
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 56,844,034us-gaap_TemporaryEquityCarryingAmountAttributableToParent 55,922,593us-gaap_TemporaryEquityCarryingAmountAttributableToParent
Commitments and Contingencies      
Stockholders’ deficit:    
Common stock, $0.001 par value; 600,000,000 shares authorized; 335,152 and 333,756 shares issued and outstanding, respectively, at March 31, 2015, 334,003 and 332,607 shares issued and outstanding , respectively, at December 31, 2014 334us-gaap_CommonStockValue 333us-gaap_CommonStockValue
Distributions in excess of capital (2,255,166)htgm_DistributionsInExcessDeficitOfCapital (1,426,556)htgm_DistributionsInExcessDeficitOfCapital
Treasury stock – 1,396 shares, at cost (75,000)us-gaap_TreasuryStockValue (75,000)us-gaap_TreasuryStockValue
Accumulated deficit (72,256,837)us-gaap_RetainedEarningsAccumulatedDeficit (68,168,703)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' deficit (74,586,669)us-gaap_StockholdersEquity (69,669,926)us-gaap_StockholdersEquity
Total liabilities and stockholders' deficit 7,666,339us-gaap_LiabilitiesAndStockholdersEquity 8,728,246us-gaap_LiabilitiesAndStockholdersEquity
Series A Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 1,402,907us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 1,402,687us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Stockholders’ deficit:    
Total stockholders' deficit 1,402,907us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 1,402,687us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 2,099,886us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 2,099,310us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Stockholders’ deficit:    
Total stockholders' deficit 2,099,886us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember		 2,099,310us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series C-1 Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 4,568,581us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCOneRedeemableConvertiblePreferredStockMember		 4,567,525us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCOneRedeemableConvertiblePreferredStockMember
Stockholders’ deficit:    
Total stockholders' deficit 4,568,581us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCOneRedeemableConvertiblePreferredStockMember		 4,567,525us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCOneRedeemableConvertiblePreferredStockMember
Series C-2 Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 2,224,957us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCTwoRedeemableConvertiblePreferredStockMember		 2,223,506us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCTwoRedeemableConvertiblePreferredStockMember
Stockholders’ deficit:    
Total stockholders' deficit 2,224,957us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCTwoRedeemableConvertiblePreferredStockMember		 2,223,506us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= htgm_SeriesCTwoRedeemableConvertiblePreferredStockMember
Series D Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 37,787,179us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 37,174,666us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Stockholders’ deficit:    
Total stockholders' deficit 37,787,179us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember		 37,174,666us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
Series E Redeemable Convertible Preferred Stock    
Redeemable convertible preferred stock:    
Total Redeemable Convertible Preferred Stock 8,760,524us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember		 8,454,899us-gaap_TemporaryEquityCarryingAmountAttributableToParent
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Stockholders’ deficit:    
Total stockholders' deficit $ 8,760,524us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember		 $ 8,454,899us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember