Condensed Statements of Changes in Stockholders' Deficit (Parenthetical) $ in Millions	12 Months Ended
Dec. 31, 2017 USD ($)
Statement Of Stockholders Equity [Abstract]
At the market offering, issuance costs	$ 0.8

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

No definition available.

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