UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common stock	Additional Paid-in Capital	Contingently Issuable Common Stock	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		48,943,082
Beginning balance at Dec. 31, 2020	$ 120,785	$ 5	$ 395,491	$ 17,600	$ (292,311)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation	2,478		2,478
Release of Block B Sponsor Earnout Shares from restriction (in shares)		859,000
Issuance of contingently issuable common stock (in shares)		1,999,185
Issuance of Contingently Issuable Common Stock			17,600	(17,600)
Exercise of warrants (in shares)		0
Cancellation of shares used to settle payroll tax withholding	0
Net loss	(21,456)				(21,456)
Ending balance (in shares) at Mar. 31, 2021		51,801,267
Ending balance at Mar. 31, 2021	101,807	$ 5	415,569	0	(313,767)
Beginning balance (in shares) at Dec. 31, 2021		53,786,632
Beginning balance at Dec. 31, 2021	32,447	$ 5	448,969	0	(416,527)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation	3,943		3,943
Exercise of warrants (in shares)		600
Exercise of warrants	7		7
Release of restricted stock units (in shares)		305,651
Cancellation of shares used to settle payroll tax withholding (in shares)		(112,275)
Cancellation of shares used to settle payroll tax withholding	(826)		(826)
Net loss	(45,791)				(45,791)
Ending balance (in shares) at Mar. 31, 2022		53,980,608
Ending balance at Mar. 31, 2022	$ (10,220)	$ 5	$ 452,093	$ 0	$ (462,318)