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						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Net (loss) income per share - Basic:
Net (loss) income	$ (3,099)	$ (5,307)	$ (4,178)	$ (5,965)	$ (7,563)	$ 115,738	$ (12,584)	$ 102,210
Less: Undistributed earnings to preferred stockholders								(1,636)
Net (loss) income applicable to common stockholders - basic	(3,099)			(5,965)			(12,584)	100,574
Numerator for basic net (loss) income applicable to common stockholders	$ (3,099)			$ (5,965)			$ (12,584)	$ 100,574
Denominator for basic net (loss) income applicable to common stockholders	53,286			52,740			53,052	47,990
Net (loss) income applicable to common stockholders - basic	$ (0.06)			$ (0.11)			$ (0.24)	$ 2.10
Net (loss) income per share - Diluted:
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 (loss) income applicable to common stockholders	$ (3,099)			$ (5,965)			$ (12,584)	$ (23,576)
Denominator for basic net (loss) income applicable to common stockholders	53,286			52,740			53,052	47,990
Plus: Incremental shares underlying "in the money" liability-classified warrants outstanding								223
Plus: Incremental shares underlying "in the money" liability-classified future tranche rights outstanding								3,400
Denominator for diluted net income (loss) applicable to common stockholders	53,286			52,740			53,052	51,613
Net (loss) income applicable to common stockholders - diluted	$ (0.06)			$ (0.11)			$ (0.24)	$ (0.46)