Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2010	$ 17,235	$ 1,152	$ 158,236	$ (142,153)
Balance, shares at Dec. 31, 2010		115,291,000
Restricted stock issued, net		5	(5)
Restricted stock issued net, shares		535,000
Shares repurchased	(2,153)	(3)	(2,150)
Shares repurchased, shares		(386,000)
Exercise of stock options, net	538	13	525
Exercise of stock options net, shares	1,280,687	1,243,000
Stock issued for services, shares		20,000
Stock issued for services	127		127
Stock-based compensation	7,014		7,014
Net income	3,092			3,092
Balance at Dec. 31, 2011	25,853	1,167	163,747	(139,061)
Balance, shares at Dec. 31, 2011		116,703,000
Net proceeds from sale of common stock	4,329	10	4,319
Net proceeds from sale of common stock, shares		1,000,000
Restricted stock issued, net		12	(12)
Restricted stock issued net, shares		1,179,000
Shares repurchased	(2,261)	(4)	(2,257)
Shares repurchased, shares	(357,123)	(357,000)
Exercise of stock options, net	4,672	80	4,592
Exercise of stock options net, shares	8,018,516	8,019,000
Stock issued for services, shares		10,000
Stock issued for services	28		28
Stock-based compensation	7,409		7,409
Net income	11,030			11,030
Balance at Dec. 31, 2012	51,060	1,265	177,826	(128,031)
Balance, shares at Dec. 31, 2012		126,554,000
Restricted stock issued, net		10	(10)
Restricted stock issued net, shares		974,000
Shares repurchased	(1,613)	(1)	(1,612)
Shares repurchased, shares	(136,641)	(137,000)
Exercise of stock options, net	1,586	48	1,538
Exercise of stock options net, shares	4,875,500	4,856,000
Stock-based compensation	6,459		6,459
Net income	51,537			51,537
Balance at Dec. 31, 2013	$ 109,029	$ 1,322	$ 184,201	$ (76,494)
Balance, shares at Dec. 31, 2013		132,247,000