Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Income Statement [Abstract]
NET REVENUES	$ 62,339		$ 59,171		$ 122,196		$ 118,904
COST OF REVENUES	29,548	[1]	28,089	[1]	58,186	[1]	56,742	[1]
GROSS PROFIT	32,791		31,082		64,010		62,162
OPERATING EXPENSES:
Research and development	15,436	[1]	13,501	[1]	30,917	[1]	27,272	[1]
Selling, general and administrative	11,976	[1]	11,433	[1]	24,412	[1]	23,294	[1]
Total operating expenses	27,412		24,934		55,329		50,566
INCOME FROM OPERATIONS	5,379		6,148		8,681		11,596
INTEREST AND OTHER INCOME (EXPENSE):
Interest income	92		126		195		252
Other expense, net	(8)		(52)		(80)		(143)
Total interest and other income (expense), net	84		74		115		109
INCOME BEFORE PROVISION FOR INCOME TAXES	5,463		6,222		8,796		11,705
PROVISION FOR INCOME TAXES	1,934		1,187		2,978		1,425
NET INCOME	$ 3,529		$ 5,035		$ 5,818		$ 10,280
NET INCOME PER SHARE:
Basic (Per Share)	$ 0.06		$ 0.09		$ 0.10		$ 0.18
Diluted (Per Share)	$ 0.06		$ 0.09		$ 0.10		$ 0.17
CASH DIVIDENDS DECLARED PER COMMON SHARE	$ 0.05		$ 0.0425		$ 0.10		$ 0.0425
WEIGHTED AVERAGE SHARES USED IN COMPUTING PER SHARE AMOUNTS:
Basic (Shares)	56,537		58,303		56,463		58,287
Diluted (Shares)	57,448		59,007		57,331		59,021

[1] Share-based compensation expense included in:Cost of revenues$243 $270 $477 $514Research and development833 652 1,523 1,304Selling, general and administrative873 772 1,671 1,495