Consolidated Statements Of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock And Additional Paid - In Capital [Member]	Warrants [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Total Comprehensive Income (Loss) [Member]	Total
Balance at Dec. 31, 2008	$ 167,870	$ 1,731	$ 109	$ (71,543)	$ (18,389)		$ 79,778
Balance ,shares at Dec. 31, 2008	30,674,045				2,786,563
Cumulative effect of change in accounting principle		(1,713)		1,196			(517)
Net loss				(28,279)		(28,279)	(28,279)
Foreign currency translation adjustment			11			11	11
Unrealized gain (loss) on available-for-sale securities, net of taxes			(54)			(54)	(54)
Comprehensive loss						(28,322)
Issuance of stock for ESPP purchase	134						134
Issuance of stock for ESPP purchase, shares	30,376
Exercise of stock options	145						145
Exercise of stock options, shares	71,207
Release of restricted stock units and awards	64						64
Release of restricted stock units and awards, shares	10,528
Expiration of warrants	7	(7)					0
Stock based compensation	4,459						4,459
Balance at Dec. 31, 2009	172,679	11	66	(98,626)	(18,389)		55,741
Balance, shares at Dec. 31, 2009	30,786,156				2,786,563
Net loss				(5,927)		(5,927)	(5,927)
Unrealized gain (loss) on available-for-sale securities, net of taxes			54			54	54
Comprehensive loss						(5,873)
Repurchase of stock					(9)		(9)
Repurchase of stock, shares					1,646
Exercise of stock options	427						427
Exercise of stock options, shares	130,135
Release of restricted stock units and awards	469						469
Release of restricted stock units and awards, shares	100,521
Expiration of warrants		(11)					(11)
Stock based compensation	2,940						2,940
Balance at Dec. 31, 2010	176,515	0	120	(104,553)	(18,398)		53,684
Balance, shares at Dec. 31, 2010	31,016,812				2,788,209
Net loss				(1,604)		(1,604)	(1,604)
Unrealized gain (loss) on available-for-sale securities, net of taxes			(2)			(2)	(2)
Comprehensive loss						(1,606)
Repurchase of stock					(6,450)		(6,450)
Repurchase of stock, shares					1,139,997
Issuance of stock for ESPP purchase	145						145
Issuance of stock for ESPP purchase, shares	28,702
Exercise of stock options	2,293						2,293
Exercise of stock options, shares	560,132
Release of restricted stock units and awards	1,323						1,323
Release of restricted stock units and awards, shares	180,384
Stock based compensation	2,232						2,232
Balance at Dec. 31, 2011	$ 182,508	$ 0	$ 118	$ (106,157)	$ (24,848)		$ 51,621
Balance, shares at Dec. 31, 2011	31,786,030				3,928,206