CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (UNAUDITED) - USD ($) $ in Thousands		Total	Common Stock		Treasury Stock		Additional Paid-in Capital		Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2019	[1]		345,431		22,103
Beginning balance at Dec. 31, 2019		$ (439,251)	$ 0	[1]	$ 0	[1]	$ 5,187	[1]	$ (444,438)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(34,618)							(34,618)
Ending balance (in shares) at Mar. 31, 2020	[1]		345,431		22,103
Ending balance at Mar. 31, 2020		(473,869)	$ 0	[1]	$ 0	[1]	5,187	[1]	(479,056)
Beginning balance (in shares) at Dec. 31, 2019	[1]		345,431		22,103
Beginning balance at Dec. 31, 2019		(439,251)	$ 0	[1]	$ 0	[1]	5,187	[1]	(444,438)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Vesting of restricted stock units		1,800
Ending balance (in shares) at Dec. 31, 2020			59,901,306		0
Ending balance at Dec. 31, 2020		16,617	$ 6		$ 0		537,370		(520,759)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation costs		507					507	[1]
Vesting of restricted stock units	[2]	115					115
Net loss		(9,688)							(9,688)
Ending balance (in shares) at Mar. 31, 2021	[1]		59,901,306		0
Ending balance at Mar. 31, 2021		$ 7,551	$ 6	[1]	$ 0	[1]	$ 537,992	[1]	$ (530,447)

[1] Retroactively restated January 1, 2020 and March 31, 2020 for the reverse recapitalization as described in Note 3 - Recapitalization Transaction, and the restated reclassification of the Company's 5-Year Private Warrants as described in Note 11 - Warrant Liabilities.

[2] As of March 31, 2021, there were 16,441 unissued shares underlying restricted stock units that had vested.