Fair Value Instruments - Additional Information (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Fair Value Disclosures [Abstract]
Fair value assets, Level 1 to Level 2 transfers, Amount	$ 0	$ 0
Fair value, assets, Level 2 to Level 1 transfers, Amount	$ 0	$ 0

Fair value assets level two to level one transfers amount.

No definition available.

Name:	htgm_FairValueAssetsLevel2ToLevel1TransfersAmount1
Namespace Prefix:	htgm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant