UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning balance at Dec. 31, 2019		$ 172,029	$ 6	$ (33,484)	$ 347,564	$ 181	$ (142,238)
Beginning balance (in shares) at Dec. 31, 2019			63,657	(4,145)
Increase (Decrease) in Equity
Net loss		(63,967)					(63,967)
Foreign currency translation adjustment		(123)				(123)
Stock issued under employee stock purchase plan		11			11
Stock issued under employee stock purchase plan (in shares)				(13)
Restricted stock granted		338			338
Restricted stock granted (in shares)			681
Restricted stock forfeited (in shares)				241
Treasury stock purchased		(45)		$ (45)
Treasury stock purchased (in shares)				22
Stock compensation expense		462			462
Ending balance at Mar. 31, 2020		108,705	$ 6	$ (33,529)	348,375	58	(206,205)
Ending balance (in shares) at Mar. 31, 2020			64,338	(4,395)
Beginning balance at Dec. 31, 2020		47,171	$ 8	$ (33,851)	359,721	(19)	(278,688)
Beginning balance (in shares) at Dec. 31, 2020			78,669	(5,581)
Increase (Decrease) in Equity
Net loss		(8,300)					(8,300)
Foreign currency translation adjustment		49				49
Stock issued under employee stock purchase plan		38			38
Stock issued under employee stock purchase plan (in shares)				(58)
Restricted stock granted (in shares)			220
Restricted stock forfeited (in shares)				5
Treasury stock purchased		(105)		$ (105)
Treasury stock purchased (in shares)				45
Stock compensation expense		778			778
Other (in shares)	[1]		(613)
Ending balance at Mar. 31, 2021		$ 39,631	$ 8	$ (33,956)	$ 360,537	$ 30	$ (286,988)
Ending balance (in shares) at Mar. 31, 2021			78,276	(5,573)

[1] See Note 14, “Stockholders’ Equity” for further discussion.