Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Preferred Stock Series A	Preferred Stock Series A Preferred Stock	Preferred Stock Series B	Preferred Stock Series B Preferred Stock	Preferred Stock Series B Common Stock	Preferred Stock Series B Additional Paid-In Capital
Beginning balance, preferred stock (in shares) at Dec. 31, 2018							2,093,155		3,100
Beginning balance, common stock (in shares) at Dec. 31, 2018		70,793,725
Beginning balance at Dec. 31, 2018	$ 29,742	$ 71	$ 381,004	$ (47)	$ (351,288)		$ 2		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	5,418		5,418
Stock option exercises (in shares)		799,800
Stock option exercises	2,319		2,319
Restricted stock awards (in shares)		806,661
Restricted stock awards		$ 1	(1)
Preferred stock conversion to common stock (in shares)									(2,482)	13,788,888
Preferred stock conversion to common stock										$ 14	$ (14)
Equity offering, net of finance costs (in shares)		10,000,000
Equity offering, net of finance costs	47,590	$ 10	47,580
Net income (loss)	(15,305)				(15,305)
Ending balance, preferred stock (in shares) at Dec. 31, 2019							2,093,155		618
Ending balance, common stock (in shares) at Dec. 31, 2019		96,189,074
Ending balance at Dec. 31, 2019	69,764	$ 96	436,306	(47)	(366,593)		$ 2		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	9,595		9,595
Stock option exercises (in shares)		1,400,003
Stock option exercises	3,370	$ 1	3,369
Restricted stock awards (in shares)		762,987
Restricted stock awards		$ 4	(4)
Preferred stock conversion to common stock (in shares)							(2,093,155)		(175)	3,065,377
Preferred stock conversion to common stock						$ (2)	$ (2)	$ 1		$ 3	$ (2)
Share repurchase	(205)			(205)
Net income (loss)	$ 25,711				25,711
Ending balance, preferred stock (in shares) at Dec. 31, 2020						0	0		443
Ending balance, common stock (in shares) at Dec. 31, 2020	101,354,447	101,417,441
Ending balance at Dec. 31, 2020	$ 108,234	$ 104	449,264	(252)	(340,882)		$ 0		$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 6,168		6,168
Stock option exercises (in shares)	160,023	160,023
Stock option exercises	$ 463		463
Restricted stock awards (in shares)		542,825
Share repurchase	(11,903)			(11,903)
Net income (loss)	$ 84,860				84,860
Ending balance, preferred stock (in shares) at Dec. 31, 2021							0	443	443
Ending balance, common stock (in shares) at Dec. 31, 2021	98,854,605	102,120,289
Ending balance at Dec. 31, 2021	$ 187,822	$ 104	$ 455,895	$ (12,155)	$ (256,022)		$ 0		$ 0