Class of warrant or right issued.

No definition available.

Name:	htgm_ClassOfWarrantOrRightIssued
Namespace Prefix:	htgm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Class of warrant or right warrants exercised.

+ References

No definition available.

+ Details

Name:	htgm_ClassOfWarrantOrRightWarrantsExercised
Namespace Prefix:	htgm_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Exercise price of warrants or rights exercisable subject to beneficial ownership limitations.

+ References

No definition available.

+ Details

Name:	htgm_ExercisePriceOfWarrantsOrRightsExercisableSubjectToBeneficialOwnershipLimitations
Namespace Prefix:	htgm_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

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.

+ References

No definition available.

+ Details

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

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775

+ Details

Name:	us-gaap_ClassOfWarrantOrRightUnissued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=htgm_PreFundedWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=htgm_InstitutionalAccreditedInvestorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Net Loss per Share - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Class Of Warrant Or Right [Line Items]
Proceeds from exercise of pre-funded warrants			$ 31,768
Pre-funded Warrants
Class Of Warrant Or Right [Line Items]
Exercise price of warrants			$ 0.01
Private Placement \| Institutional Accredited Investors
Class Of Warrant Or Right [Line Items]
Exercise price of warrants			$ 0.65	$ 0.65
Private Placement \| Institutional Accredited Investors \| Pre-funded Warrants
Class Of Warrant Or Right [Line Items]
Issuance of warrants, shares			5,411,687	5,411,687
Number of securities called by warrants			5,411,687	5,411,687
Exercise price of warrants			$ 0.64	$ 0.64
Exercise price of warrants, exercisable subject to beneficial ownership limitations			$ 0.01	$ 0.01
Warrants exercised	3,176,762	3,176,762
Proceeds from exercise of pre-funded warrants	$ 31,768	$ 31,768
Unexercised warrants outstanding			2,234,925