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Equity-based Compensation - Compensation expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity-based Compensation
Total equity-based compensation	$ 72	$ 129	$ 264	$ 342
Total unrecognized compensation cost related to options	887		$ 887
Weighted average period over which the unrecognized compensation cost is expected to be recognized			2 years 7 months 6 days
Research and development
Equity-based Compensation
Total equity-based compensation	(4)	56	$ 30	161
General and administrative
Equity-based Compensation
Total equity-based compensation	$ 76	$ 73	$ 234	$ 181

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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