Liquidity and Going Concern Uncertainty (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 10,734			$ 2,670			$ 10,734	$ 2,670	$ 5,058
Working capital	12,410						12,410
Net loss	$ 662	$ 2,246	$ 3,433	$ 2,085	$ 3,385	$ 3,129	6,341	8,598
Net cash used in operating activities							$ 5,956	$ 4,325