Net Income (Loss) per Common Share -Computation of basic and diluted net income per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Net income (loss) per share - Basic:
Net income (loss)	$ (5,307)	$ (4,178)	$ (7,563)	$ 115,738	$ (9,485)	$ 108,175
Less: Undistributed earnings to preferred stockholders						(2,725)
Net income (loss) applicable to common stockholders	(5,307)		(7,563)		(9,485)	105,450
Numerator for basic net income (loss) applicable to common stockholders	$ (5,307)		$ (7,563)		$ (9,485)	$ 105,450
Denominator for basic net income (loss) applicable to common stockholders	52,972		49,909		52,933	45,575
Net income (loss) income applicable to common stockholders - basic	$ (0.10)		$ (0.15)		$ (0.18)	$ 2.31
Net income (loss) per share - Diluted:
- Basic	$ (5,307)		$ (7,563)		$ (9,485)	$ 105,450
Less: Warrant revaluation gain applicable to dilutive liability-classified warrants						(6,983)
Less: Future tranche right revaluation gain applicable to dilutive liability-classified future tranche rights						(118,803)
Numerator for diluted net income (loss) applicable to common stockholders	$ (5,307)		$ (7,563)		$ (9,485)	$ (17,611)
Denominator for basic net income (loss) applicable to common stockholders	52,972		49,909		52,933	45,575
Plus: Incremental shares underlying "in the money" liability-classified warrants outstanding						496
Plus: Incremental shares underlying "in the money" liability-classified future tranche rights outstanding						8,866
Denominator for diluted net income (loss) applicable to common stockholders	52,972		49,909		52,933	54,937
Net income (loss) applicable to common stockholders - diluted	$ (0.10)		$ (0.15)		$ (0.18)	$ (0.32)