Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Operations [Abstract]
Revenues	$ 57,767	$ 130,501	$ 107,279
Cost of revenues	13,761	15,507	15,486
Gross profit	44,006	114,994	91,793
Operating expenses:
Selling and marketing	26,594	29,708	24,999
Research and development	41,711	42,759	36,530
General and administrative	25,279	24,146	19,155
Restructuring expenses	3,184
Goodwill and long-lived asset impairment	112,904
Total operating expenses	209,672	96,613	80,684
Operating income (loss)	(165,666)	18,381	11,109
Interest and other income	131	130	381
Income (loss) before taxes	(165,535)	18,511	11,490
Income tax expense (benefit)	(5,929)	6,165	6,738
Net income (loss)	$ (159,606)	$ 12,346	$ 4,752
Net income (loss) per share:
Basic	$ (4.48)	$ 0.36	$ 0.15
Diluted	$ (4.48)	$ 0.36	$ 0.14
Weighted average shares outstanding:
Basic	35,617	34,204	32,438
Diluted	35,617	34,615	32,897