Condensed Consolidated Statements of Changes in Stockholders' Equity (Deficit) (Parenthetical) - USD ($)	3 Months Ended
Sep. 30, 2019	Mar. 31, 2018
Statement Of Stockholders Equity [Abstract]
Public and private offerings issuance costs	$ 1,700,000
At the market offering, issuance costs		$ 17,000
Public offering issuance costs		$ 2,600,000

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

No definition available.

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