Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common stock [Member]	Treasury Stock [Member]	Additional paid-in Capital [Member]	Accum Other Comp Inc. [Member]	Accum deficit [Member]
Beginning Balance at Dec. 31, 2010	$ 192,094	$ 23	$ (5,661)	$ 327,515	$ (10)	$ (129,773)
Beginning Balance, Treasury Shares at Dec. 31, 2010			(1,249,975)
Beginning Balance, Shares at Dec. 31, 2010		24,210,644
Exercise of stock options	742	1		741
Exercise of stock options, Shares	73,428	71,355
Stock-based compensation	2,297			2,297
Excess tax benefit of stock based compensation	1,404			1,404
Stock issued to Board of Directors	162			162
Stock issued to Board of Directors, Shares		7,724
Purchase of treasury stock, at cost	(6,487)		(6,487)
Purchase of treasury stock, at cost, Shares			(524,869)
Foreign currency translation adjustments	2				2
Unrealized gain (loss) on investments, net of tax	(42)				(42)
Net income (loss)	38,059					38,059
Ending Balance at Dec. 31, 2011	228,231	24	(12,148)	332,119	(50)	(91,714)
Ending Balance, Treasury Shares at Dec. 31, 2011			(1,774,844)
Ending Balance, Shares at Dec. 31, 2011		24,289,723
Exercise of stock options	73	1		72
Exercise of stock options, Shares	17,885	17,884
Net exercise of stock warrants
Net exercise of stock warrants, Shares		2,188
Stock-based compensation	1,801			1,801
Excess tax benefit of stock based compensation	160			160
Stock issued to Board of Directors	162			162
Stock issued to Board of Directors, Shares		17,345
Foreign currency translation adjustments	(8)				(8)
Unrealized gain (loss) on investments, net of tax	505				505
Net income (loss)	(5,538)					(5,538)
Ending Balance at Dec. 31, 2012	225,386	25	(12,148)	334,314	447	(97,252)
Ending Balance, Treasury Shares at Dec. 31, 2012	(1,774,844)		(1,774,844)
Ending Balance, Shares at Dec. 31, 2012		24,327,140
Exercise of stock options	140			140
Exercise of stock options, Shares	27,930	27,930
Stock-based compensation	1,246			1,246
Excess tax benefit of stock based compensation	(114)			(114)
Restricted stock issued	292			292
Restricted stock issued, shares		73,709
Stock issued to Board of Directors	57			57
Stock issued to Board of Directors, Shares		4,744
Foreign currency translation adjustments	(2)				(2)
Unrealized gain (loss) on investments, net of tax	(863)				(863)
Net income (loss)	(30,351)					(30,351)
Ending Balance at Dec. 31, 2013	$ 195,791	$ 25	$ (12,148)	$ 335,935	$ (418)	$ (127,603)
Ending Balance, Treasury Shares at Dec. 31, 2013	(1,774,844)		(1,774,844)
Ending Balance, Shares at Dec. 31, 2013		24,433,523