Condensed Consolidated Statement of Stockholders' Deficit (unaudited) - USD ($) $ in Thousands	Total	Reclassification Adjustment	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital Reclassification Adjustment	Accumulated Deficit
Balance (in shares) at Dec. 31, 2019			49,033,903
Balance at Dec. 31, 2019	$ (12,130)		$ 5	$ 432,577		$ (444,712)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net loss	(15,969)					(15,969)
Share-based payments	559			559
Balance (in shares) at Mar. 31, 2020			49,033,903
Balance at Mar. 31, 2020	$ (27,540)		$ 5	433,136		(460,681)
Balance (in shares) at Dec. 31, 2020	49,156,753		49,156,753
Balance at Dec. 31, 2020	$ (31,067)	$ (10,290)	$ 5	434,917	$ (10,290)	(465,989)
Increase (Decrease) in Stockholders' Deficit [Roll Forward]
Net loss	(27,907)					(27,907)
Share-based payments (in shares)			62,630
Share-based payments	$ 597			597
Balance (in shares) at Mar. 31, 2021	49,219,383		49,219,383
Balance at Mar. 31, 2021	$ (68,667)		$ 5	$ 425,224		$ (493,896)