XML 19 R50.htm IDEA: XBRL DOCUMENT v2.4.1.9
Related-Party Transactions - Additional Information (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Related Party Transaction [Line Items]    
Number of consulting agreement 2htgm_NumberOfConsultingAgreementWithRelatedParty  
Series D Stock    
Related Party Transaction [Line Items]    
Consulting fees paid to stockholder $ 0us-gaap_CostsAndExpensesRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= htgm_SeriesDStockHolderMember		  
Series E Stock    
Related Party Transaction [Line Items]    
Consulting fees paid to stockholder   $ 11,000us-gaap_CostsAndExpensesRelatedParty
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= htgm_SeriesEStockHolderMember