UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($)	Total	Common stock	Additional Paid-in Capital	Contingently Issuable Common Stock	Accumulated Other Comprehensive Income	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2020		48,943,082
Beginning balance at Dec. 31, 2020	$ 120,785,000	$ 5,000	$ 395,491,000	$ 17,600,000	$ 0	$ (292,311,000)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation	5,673,000		5,673,000
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			17,600,000	(17,600,000)
Exercise of stock options (in shares)		87,177
Exercise of warrants	756,000		756,000
Exercise of warrants (in shares)		1,465,414
Exercise of warrants	16,852,000		16,852,000
Cancellation of shares used to settle payroll tax withholding	0
Foreign currency translation adjustment, net of tax	0
Net loss	(75,499,000)					(75,499,000)
Ending balance (in shares) at Jun. 30, 2021		53,353,858
Ending balance at Jun. 30, 2021	68,567,000	$ 5,000	436,372,000	0	0	(367,810,000)
Beginning balance (in shares) at Mar. 31, 2021		51,801,267
Beginning balance at Mar. 31, 2021	101,807,000	$ 5,000	415,569,000	0	0	(313,767,000)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation	3,195,000		3,195,000
Exercise of stock options (in shares)		87,177
Exercise of warrants	756,000		756,000
Exercise of warrants (in shares)		1,465,414
Exercise of warrants	16,852,000		16,852,000
Cancellation of shares used to settle payroll tax withholding	0
Foreign currency translation adjustment, net of tax	0
Net loss	(54,043,000)					(54,043,000)
Ending balance (in shares) at Jun. 30, 2021		53,353,858
Ending balance at Jun. 30, 2021	$ 68,567,000	$ 5,000	436,372,000	0	0	(367,810,000)
Beginning balance (in shares) at Dec. 31, 2021	53,786,632	53,786,632
Beginning balance at Dec. 31, 2021	$ 32,447,000	$ 5,000	448,969,000	0	0	(416,527,000)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation	7,377,000		7,377,000
Exercise of warrants (in shares)		600
Exercise of warrants	7,000		7,000
Release of restricted stock units (in shares)		427,607
Cancellation of shares used to settle payroll tax withholding (in shares)		(128,156)
Cancellation of shares used to settle payroll tax withholding	(852,000)		(852,000)
Issuance of common stock under SEPA (in shares)		3,967,939
Issuance of common stock under SEPA	4,604,000	$ 1,000	4,603,000
Commitment fee for SEPA settled by common stock (in shares)		465,117
Commitment fee for SEPA settled by common stock	1,061,000		1,061,000
Foreign currency translation adjustment, net of tax	5,000				5,000
Net loss	$ (102,478,000)					(102,478,000)
Ending balance (in shares) at Jun. 30, 2022	58,519,739	58,519,739
Ending balance at Jun. 30, 2022	$ (57,829,000)	$ 6,000	461,165,000	0	5,000	(519,005,000)
Beginning balance (in shares) at Mar. 31, 2022		53,980,608
Beginning balance at Mar. 31, 2022	(10,220,000)	$ 5,000	452,093,000	0	0	(462,318,000)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation	3,434,000		3,434,000
Exercise of warrants (in shares)		0
Release of restricted stock units (in shares)		121,956
Cancellation of shares used to settle payroll tax withholding (in shares)		(15,881)
Cancellation of shares used to settle payroll tax withholding	(26,000)		(26,000)
Issuance of common stock under SEPA (in shares)		3,967,939
Issuance of common stock under SEPA	4,604,000	$ 1,000	4,603,000
Commitment fee for SEPA settled by common stock (in shares)		465,117
Commitment fee for SEPA settled by common stock	1,061,000		1,061,000
Foreign currency translation adjustment, net of tax	5,000				5,000
Net loss	$ (56,687,000)					(56,687,000)
Ending balance (in shares) at Jun. 30, 2022	58,519,739	58,519,739
Ending balance at Jun. 30, 2022	$ (57,829,000)	$ 6,000	$ 461,165,000	$ 0	$ 5,000	$ (519,005,000)