Condensed Statements of Changes in Stockholders' Equity (Deficit) (Parenthetical)	9 Months Ended
Sep. 30, 2018 USD ($)
Statement Of Stockholders Equity [Abstract]
Public offering issuance costs	$ 2,600,000
At the market offering, issuance costs	$ 17,000

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

No definition available.

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