Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2021	Mar. 31, 2021
Statement of Stockholders' Equity [Abstract]
At the market offering, commissions and issuance costs	$ 0.1	$ 0.2

Issuance of common stock from at the market offering commissions and issuance costs.

No definition available.

Name:	htgm_IssuanceOfCommonStockFromAtTheMarketOfferingCommissionsAndIssuanceCosts
Namespace Prefix:	htgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration