CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
REVENUE:
Material sales	$ 113,066	$ 126,885	$ 95,713
Royalty and license fees	77,773	63,192	47,006
Technology development and support revenue	207	954	3,920
Total revenue	191,046	191,031	146,639
OPERATING EXPENSES:
Cost of material sales	62,997	41,315	28,889
Research and development	44,641	41,154	34,215
Selling, general and administrative	29,046	28,135	24,745
Patent costs and amortization of acquired technology	16,716	17,288	17,273
Royalty and license expense	5,370	4,519	3,273
Total operating expenses	158,770	132,411	108,395
Operating income	32,276	58,620	38,244
INTEREST INCOME	837	777	811
INTEREST EXPENSE	(54)	(70)	(47)
INCOME BEFORE INCOME TAXES	33,059	59,327	39,008
INCOME TAX (EXPENSE) BENEFIT	(18,381)	(17,473)	35,044
NET INCOME	$ 14,678	$ 41,854	$ 74,052
NET INCOME PER COMMON SHARE:
BASIC (in dollars per share)	$ 0.31	$ 0.90	$ 1.61
DILUTED (in dollars per share)	$ 0.31	$ 0.90	$ 1.59
WEIGHTED AVERAGE SHARES USED IN COMPUTING NET INCOME PER COMMON SHARE:
BASIC (in shares)	46,816,394	46,252,960	45,898,019
DILUTED (in shares)	47,494,188	46,685,145	46,543,605