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, 2019	[1]		3,930,336
Beginning balance at Dec. 31, 2019		$ (183,722)	$ 0	[1]	$ 20,346	$ 0	$ (204,068)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation		19			19
Net loss		(9,348)					(9,348)
Ending balance (in shares) at Mar. 31, 2020	[1]		3,930,336
Ending balance at Mar. 31, 2020		(193,051)	$ 0	[1]	20,365	0	(213,416)
Beginning balance (in shares) at Dec. 31, 2019	[1]		3,930,336
Beginning balance at Dec. 31, 2019		(183,722)	$ 0	[1]	20,346	0	(204,068)
Increase (decrease) in stockholders' equity [Roll Forward]
Net loss		(15,232)
Ending balance (in shares) at Jun. 30, 2020	[1]		3,930,336
Ending balance at Jun. 30, 2020		(198,898)	$ 0	[1]	20,402	0	(219,300)
Beginning balance (in shares) at Dec. 31, 2019	[1]		3,930,336
Beginning balance at Dec. 31, 2019		(183,722)	$ 0	[1]	20,346	0	(204,068)
Increase (decrease) in stockholders' equity [Roll Forward]
Net loss		(70,643)					(70,643)
Ending balance (in shares) at Dec. 31, 2020	[1]		48,943,082
Ending balance at Dec. 31, 2020		120,785	$ 5	[1]	395,491	17,600	(292,311)
Beginning balance (in shares) at Mar. 31, 2020	[1]		3,930,336
Beginning balance at Mar. 31, 2020		(193,051)	$ 0	[1]	20,365	0	(213,416)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation		37			37
Net loss		(5,884)					(5,884)
Ending balance (in shares) at Jun. 30, 2020	[1]		3,930,336
Ending balance at Jun. 30, 2020		(198,898)	$ 0	[1]	20,402	0	(219,300)
Beginning balance (in shares) at Dec. 31, 2020	[1]		48,943,082
Beginning balance at Dec. 31, 2020		120,785	$ 5	[1]	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)	[1],[2]		859,000
Issuance of Contingently Issuable Common Stock (in shares)	[1],[3]		1,999,185
Issuance of Contingently Issuable Common Stock	[3]	0			17,600	(17,600)
Net loss		(21,456)					(21,456)
Ending balance (in shares) at Mar. 31, 2021	[1]		51,801,267
Ending balance at Mar. 31, 2021		101,807	$ 5	[1]	415,569	0	(313,767)
Beginning balance (in shares) at Dec. 31, 2020	[1]		48,943,082
Beginning balance at Dec. 31, 2020		$ 120,785	$ 5	[1]	395,491	17,600	(292,311)
Increase (decrease) in stockholders' equity [Roll Forward]
Exercise of stock options (in shares)		87,177
Exercise of public warrants (in shares)			1,465,414
Net loss		$ (75,499)
Ending balance (in shares) at Jun. 30, 2021	[1]		53,353,858
Ending balance at Jun. 30, 2021		68,567	$ 5	[1]	436,372	0	(367,810)
Beginning balance (in shares) at Mar. 31, 2021	[1]		51,801,267
Beginning balance at Mar. 31, 2021		101,807	$ 5	[1]	415,569	0	(313,767)
Increase (decrease) in stockholders' equity [Roll Forward]
Stock-based compensation		$ 3,195			3,195
Exercise of stock options (in shares)		87,177
Exercise of stock options		$ 756
Exercise of public warrants (in shares)	[1]		1,465,414
Adjustments to Additional Paid in Capital, Warrant Issued		16,852			16,852
Net loss		(54,043)					(54,043)
Ending balance (in shares) at Jun. 30, 2021	[1]		53,353,858
Ending balance at Jun. 30, 2021		$ 68,567	$ 5	[1]	$ 436,372	$ 0	$ (367,810)

[1] 3

[2] 4 See Note 18 for discussion of Sponsor Earnout Shares

[3] 5 See Note 18 for discussion of Contingently Issuable Common Stock