Condensed 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 A Common Stock	Preferred Stock Series A Additional Paid-In Capital	Preferred Stock Series B	Preferred Stock Series B Preferred Stock	Preferred Stock Series B 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
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
Preferred stock conversion to common stock (in shares)							(2,093,155)	2,093,155			(175)	972,222
Preferred stock conversion to common stock						$ (1)	$ (2)	$ 2	$ (1)	$ 1		$ 1
Net income	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, 2019		96,189,074					2,093,155				618
Beginning Balance at Dec. 31, 2019	69,764	$ 96	436,306	(47)	(366,593)		$ 2				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,131
Ending Balance (in shares) at Jun. 30, 2020		100,916,511					0				443
Ending Balance at Jun. 30, 2020	84,770	$ 99	445,180	(47)	(360,462)		$ 0				$ 0
Beginning Balance (in shares) at Mar. 31, 2020		99,821,408					0				443
Beginning Balance at Mar. 31, 2020	76,588	$ 99	438,163	(47)	(361,627)		$ 0				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	4,786		4,786
Stock option exercises (in shares)		983,437
Stock option exercises	2,231		2,231
Restricted stock awards (in shares)		111,666
Restricted stock awards	0
Net income	1,165				1,165
Ending Balance (in shares) at Jun. 30, 2020		100,916,511					0				443
Ending Balance at Jun. 30, 2020	84,770	$ 99	445,180	(47)	(360,462)		$ 0				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,539		1,539
Stock option exercises (in shares)		68,623
Stock option exercises	192	$ 1	191
Restricted stock awards (in shares)		141,318
Restricted stock awards	0
Net income	9,384				9,384
Ending Balance (in shares) at Sep. 30, 2020		101,126,452					0				443
Ending Balance at Sep. 30, 2020	95,885	$ 100	446,910	(47)	(351,078)		$ 0				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,750		1,750
Stock option exercises (in shares)		240,656
Stock option exercises	609	$ 1	608
Restricted stock awards (in shares)		50,333
Restricted stock awards	(1)	$ 3	(4)
Share repurchase	(205)			(205)
Net income	10,196				10,196
Ending Balance (in shares) at Dec. 31, 2020		101,417,441					0				443
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	1,490		1,490
Stock option exercises (in shares)		16,619
Stock option exercises	40		40
Restricted stock awards (in shares)		268,174
Restricted stock awards	0
Share repurchase	(6,147)			(6,147)
Net income	5,237				5,237
Ending Balance (in shares) at Mar. 31, 2021		101,702,234					0				443
Ending Balance at Mar. 31, 2021	108,854	$ 104	450,794	(6,399)	(335,645)		$ 0				$ 0
Beginning Balance (in shares) at Dec. 31, 2020		101,417,441					0				443
Beginning Balance at Dec. 31, 2020	$ 108,234	$ 104	449,264	(252)	(340,882)		$ 0				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)	42,447
Net income	$ 14,301
Ending Balance (in shares) at Jun. 30, 2021		101,794,730					0				443
Ending Balance at Jun. 30, 2021	113,918	$ 104	452,550	(12,155)	(326,581)		$ 0				$ 0
Beginning Balance (in shares) at Mar. 31, 2021		101,702,234					0				443
Beginning Balance at Mar. 31, 2021	108,854	$ 104	450,794	(6,399)	(335,645)		$ 0				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,697		1,697
Stock option exercises (in shares)		25,828
Stock option exercises	59		59
Restricted stock awards (in shares)		66,668
Restricted stock awards	0
Share repurchase	(5,756)			(5,756)
Net income	9,064				9,064
Ending Balance (in shares) at Jun. 30, 2021		101,794,730					0				443
Ending Balance at Jun. 30, 2021	$ 113,918	$ 104	$ 452,550	$ (12,155)	$ (326,581)		$ 0				$ 0