Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Quoted prices in active markets (Level 1)
Liabilities:
Derivative liability		$ 0
Quoted prices in active markets (Level 1) | Warrant
Liabilities:
Warrant liability	$ 0	0
Significant other observable inputs (Level 2)
Liabilities:
Derivative liability		0
Significant other observable inputs (Level 2) | Warrant
Liabilities:
Warrant liability	0	0
Significant unobservable inputs (Level 3)
Liabilities:
Derivative liability		387
Significant unobservable inputs (Level 3) | Warrant
Liabilities:
Warrant liability	$ 8	$ 8