CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Additional Paid-in Capital	Treasury Stock	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, shares (in shares)				1,773,683
Balance beginning of period (in shares) at Dec. 31, 2020		112,703,926
Balance, beginning of period at Dec. 31, 2020	$ (150)	$ 113	$ 158,610	$ (7,449)	$ (151,424)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Deemed dividends	(462)		(462)
Share-based compensation expense	3,244		3,244
Exercise of stock options	915		(1,364)	$ 2,279
Exercise of stock options (in shares)				(310,813)
Issuance of restricted stock	0		(3,596)	$ 3,596
Issuance of restricted stock (in shares)				742,001
Restricted stock shares canceled/forfeited	0		301	$ (301)
Restricted stock canceled/forfeited (in shares)				35,589
Shares repurchased for tax withholding (in shares)				326,839
Shares repurchased for tax withholding	(3,216)			$ (3,216)
Net loss	(8,382)				(8,382)
Balance end of period (in shares) at Mar. 31, 2021		112,703,926
Balance, end of period at Mar. 31, 2021	$ (8,051)	$ 113	156,733	$ (5,091)	(159,806)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, shares (in shares)				1,083,297
Treasury stock, shares (in shares)	778,710			778,710
Balance beginning of period (in shares) at Dec. 31, 2021	112,703,926	112,703,926
Balance, beginning of period at Dec. 31, 2021	$ 82	$ 113	165,695	$ (4,017)	(161,709)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	3,998		3,998
Exercise of stock options	$ 166		(972)	$ 1,138
Exercise of stock options (in shares)	(124,334)			(124,334)
Issuance of restricted stock	$ 0	$ 1	(3,237)	$ 3,236
Issuance of restricted stock (in shares)		821,252		732,053
Restricted stock shares canceled/forfeited	0		6	$ (6)
Restricted stock canceled/forfeited (in shares)				667
Shares repurchased for tax withholding (in shares)				249,778
Shares repurchased for tax withholding	(1,191)			$ (1,191)
Net loss	$ (10,489)				(10,489)
Balance end of period (in shares) at Mar. 31, 2022	113,525,178	113,525,178
Balance, end of period at Mar. 31, 2022	$ (7,434)	$ 114	$ 165,490	$ (840)	$ (172,198)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury stock, shares (in shares)	172,768			172,768