CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Balance at Dec. 31, 2008	$ 450	$ 345,088	$ (1,649)	$ (302,228)	$ 41,661
Balance (in Shares) at Dec. 31, 2008	45,032
Net income (loss)	0	0	0	683	683
Other comprehensive income:
Net unrealized gain (loss) on available-for-sale securities, net of tax	0	0	3,247	0	3,247
Currency translation adjustment	0	0	730	0	730
Total comprehensive income (loss)	0	0	0	0	4,660
Exercises of stock options	0	56	0	0	56
Exercises of stock options (in Shares)	9
Stock-based compensation	4	8,122	0	0	8,126
Stock-based compensation (in Shares)	357
Issuance of stock for employee stock purchase plan	1	794	0	0	795
Issuance of stock for employee stock purchase plan (in Shares)	113
Repurchases of common stock	(2)	(2,013)	0	0	(2,015)
Repurchases of common stock (in Shares)	(193)
Balance at Dec. 31, 2009	453	352,047	2,328	(301,545)	53,283
Balance (in Shares) at Dec. 31, 2009	45,318
Net income (loss)	0	0	0	177,243	177,243
Other comprehensive income:
Net unrealized gain (loss) on available-for-sale securities, net of tax	0	0	(672)	0	(672)
Currency translation adjustment	0	0	(742)	0	(742)
Total comprehensive income (loss)	0	0	0	0	175,829
Conversion of notes payable	134	114,617	0	0	114,751
Conversion of notes payable (in Shares)	13,466
Exercises of stock options	41	31,710	0	0	31,751
Exercises of stock options (in Shares)	4,147
Stock-based compensation	4	3,900	0	0	3,904
Stock-based compensation (in Shares)	376
Issuance of stock for employee stock purchase plan	1	508	0	0	509
Issuance of stock for employee stock purchase plan (in Shares)	52
Repurchases of common stock	(45)	(48,125)	0	0	(48,170)
Repurchases of common stock (in Shares)	(4,541)
Balance at Dec. 31, 2010	588	454,657	914	(124,302)	331,857
Balance (in Shares) at Dec. 31, 2010	58,818
Net income (loss)	0	0	0	(20,763)	(20,763)
Other comprehensive income:
Net unrealized gain (loss) on available-for-sale securities, net of tax	0	0	(911)	0	(911)
Total comprehensive income (loss)	0	0	0	0	(21,674)
Exercises of stock options	7	5,446	0	0	5,453
Exercises of stock options (in Shares)	674
Stock-based compensation	2	1,916	0	0	1,918
Stock-based compensation (in Shares)	191
Issuance of stock for employee stock purchase plan	0	420	0	0	420
Issuance of stock for employee stock purchase plan (in Shares)	41
Repurchases of common stock	(114)	(120,679)	0	0	(120,793)
Repurchases of common stock (in Shares)	(11,431)
Balance at Dec. 31, 2011	$ 483	$ 341,760	$ 3	$ (145,065)	$ 197,181
Balance (in Shares) at Dec. 31, 2011	48,293