Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Condensed Consolidated Statements of Income [Abstract]
Net revenue	$ 39,919	$ 42,062
Cost of revenue	17,223	17,896
Gross margin	22,696	24,166
Operating expenses:
Research and development	11,513	10,398
Selling, general and administrative	7,207	6,909
Litigation	797	700
Total operating expenses	19,517	18,007
Income from operations	3,179	6,159
Non-operating expense (income), net	48	(88)
Income before income taxes	3,131	6,247
Income tax expense	95	57
Net income	$ 3,036	$ 6,190
Net income per share:
Basic	$ 0.12	$ 0.25
Diluted	$ 0.12	$ 0.23
Weighted average shares outstanding:
Basic	25,163	25,122
Diluted	25,787	26,752