Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues:
Royalty and license	$ 61,677	$ 51,804	$ 46,154
Product sales	0	0	105
Development, services, and other	1,716	1,133	1,211
Total revenues	63,393	52,937	47,470
Costs and expenses:
Cost of revenues (exclusive of amortization of intangibles shown separately below)	440	460	462
Sales and marketing	14,674	10,896	9,338
Research and development	14,785	11,793	10,883
General and administrative	28,755	23,754	23,104
Amortization of intangibles	20	67	79
Total costs and expenses	58,674	46,970	43,866
Operating income	4,719	5,967	3,604
Interest and other income	177	580	179
Other expense	(447)	(228)	(111)
Income before provision for income taxes	4,449	6,319	3,672
Benefit (provision) for income taxes	(1,591)	(2,196)	36,483
Net income	$ 2,858	$ 4,123	$ 40,155
Basic net income per share (in dollars per share)	$ 0.10	$ 0.15	$ 1.42
Shares used in calculating basic net income per share (in shares)	28,097	28,246	28,190
Diluted net income per share (in dollars per shares)	$ 0.10	$ 0.14	$ 1.37
Shares used in calculating diluted net income per share (in shares)	29,015	29,144	29,338
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ (16)	$ (10)	$ 3
Total other comprehensive income (loss)	(16)	(10)	3
Total comprehensive income	$ 2,842	$ 4,113	$ 40,158