Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit	Series A Preferred Stock	Series A Preferred Stock Preferred Stock	Series A Preferred Stock Common Stock	Series A Preferred Stock Additional Paid-In Capital	Series B Preferred Stock	Series B Preferred Stock Preferred Stock	Series B Preferred Stock Common Stock
Beginning Balance (in shares) at Dec. 31, 2019		96,189,074					2,093,155				618
Beginning Balance at Dec. 31, 2019	$ 69,764	$ 96	$ 436,306	$ (47)	$ (366,593)		$ 2				$ 0
Stock-based compensation	1,520		1,520
Stock option exercises (in shares)		107,287
Stock option exercises	338		338
Restricted stock awards (in shares)		459,670
Restricted stock awards	0
Conversion to common stock (in shares)							(2,093,155)	2,093,155			(175)	972,222
Conversion to common stock						$ (1)	$ (2)	$ 2	$ (1)	$ 1		$ 1
Net income (loss)	4,966				4,966
Ending Balance (in shares) at Mar. 31, 2020		99,821,408					0				443
Ending Balance at Mar. 31, 2020	76,588	$ 99	438,163	(47)	(361,627)		$ 0				$ 0
Beginning Balance (in shares) at Dec. 31, 2020		101,417,441									443
Beginning Balance at Dec. 31, 2020	108,234	$ 104	449,264	(252)	(340,882)						$ 0
Stock-based compensation	$ 1,490		1,490
Stock option exercises (in shares)	16,619	16,619
Stock option exercises	$ 40	$ 0	40
Restricted stock awards (in shares)		268,174
Restricted stock awards	0
Share repurchase	(6,147)			(6,147)
Net income (loss)	5,237				5,237
Ending Balance (in shares) at Mar. 31, 2021		101,702,234									443
Ending Balance at Mar. 31, 2021	$ 108,854	$ 104	$ 450,794	$ (6,399)	$ (335,645)						$ 0