Consolidated Statements of Changes in Stockholders' Equity (Deficit) (Parenthetical) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Statement Of Stockholders Equity [Abstract]
At the market offering, issuance costs		$ 17,000
Public offerings, underwriting discounts, commissions and issuance costs		$ 2,600,000
Public and private offerings, underwriting discounts, commissions and issuance costs	$ 1,700,000

Issuance of common stock from public and private offerings issuance costs.

No definition available.

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