Revenue from Contracts with Customers - Product and Product-Related Service Revenue from Sale of Instruments and Consumables (Details) - USD ($)	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Product and product-related services revenue	$ 2,023,312	$ 1,458,345	$ 3,756,858	$ 2,829,514
Product-related services revenue	2,887,454	302,411	5,312,560	302,411
HTG EdgeSeq
Disaggregation Of Revenue [Line Items]
Product and product-related services revenue	866,609	407,177	1,129,979	948,321
Product-related services revenue	1,156,703	1,051,168	2,626,879	1,881,193
HTG EdgeSeq \| Instrument
Disaggregation Of Revenue [Line Items]
Product and product-related services revenue	273,509	148,479	284,867	171,058
HTG EdgeSeq \| Consumables
Disaggregation Of Revenue [Line Items]
Product and product-related services revenue	593,100	258,698	845,112	777,263
HTG EdgeSeq \| Custom RUO assay design
Disaggregation Of Revenue [Line Items]
Product-related services revenue	176,697	304,661	303,724	345,948
HTG EdgeSeq \| Sample processing
Disaggregation Of Revenue [Line Items]
Product-related services revenue	$ 980,006	$ 746,507	$ 2,323,155	$ 1,535,245

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

+ Details

Name:	us-gaap_DisaggregationOfRevenueLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(d))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_SalesRevenueServicesNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	dei_LegalEntityAxis=htgm_HTGEdgeSeqMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=htgm_InstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=htgm_ConsumablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=htgm_CustomAssayDesignMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ProductOrServiceAxis=htgm_SampleProcessingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: