Consolidated Statements of Shareholders' Equity (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2010	$ 173,860	$ 43	$ (35,343)	$ 246,080	$ 5	$ (36,925)
Beginning balance, shares at Dec. 31, 2010		42,901,926	5,857,878
Issuance of common stock from stock options and restricted stock awards	2,817	2		2,815
Issuance of common stock from stock options and restricted stock awards, shares		1,599,464
Excess tax benefit - stock options	1,095			1,095
Stock-based compensation expense	7,469			7,469
Unrealized gain (loss) on investments (net of tax provision of $10,$1 and $(2), respectively)	14				14
Unrealized gain on foreign currency translation	(269)				(269)
Net income (loss)	4,689					4,689
Balance, December 31, 2013 at Dec. 31, 2011	189,675	45	(35,343)	257,459	(250)	(32,236)
Ending balance, shares at Dec. 31, 2011		44,501,390	5,857,878
Issuance of common stock from stock options and restricted stock awards	766	1		765
Issuance of common stock from stock options and restricted stock awards, shares		959,867
Purchase of common stock through stock repurchase program	(467)		(467)
Purchase of common stock through stock repurchase program, shares			95,940
Shelf registration fees	(69)			(69)
Excess tax benefit - stock options	4			4
Stock-based compensation expense	5,267			5,267
Unrealized gain (loss) on investments (net of tax provision of $10,$1 and $(2), respectively)	2				2
Unrealized gain on foreign currency translation	112				112
Net income (loss)	4,024					4,024
Balance, December 31, 2013 at Dec. 31, 2012	199,314	46	(35,810)	263,426	(136)	(28,212)
Ending balance, shares at Dec. 31, 2012		45,461,257	5,953,818
Issuance of common stock from stock options and restricted stock awards	1,560	2		1,558
Issuance of common stock from stock options and restricted stock awards, shares		2,186,845
Purchase of common stock through stock repurchase program	(12,409)		(12,409)
Purchase of common stock through stock repurchase program, shares			2,610,279
Purchase of common stock through tender offer (including $140 in related costs)	(35,643)		(35,643)
Purchase of common stock through tender offer, shares			7,100,565
Excess tax benefit - stock options	157			157
Stock-based compensation expense	5,585			5,585
Unrealized gain (loss) on investments (net of tax provision of $10,$1 and $(2), respectively)	(4)				(4)
Unrealized gain on foreign currency translation	339				339
Net income (loss)	(1,837)					(1,837)
Balance, December 31, 2013 at Dec. 31, 2013	$ 157,062	$ 48	$ (83,862)	$ 270,726	$ 199	$ (30,049)
Ending balance, shares at Dec. 31, 2013		47,648,102	15,664,662