CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Royalty and license	$ 11,636	$ 26,049	$ 27,427	$ 47,112
Development, services, and other	227	257	690	681
Total revenues	11,863	26,306	28,117	47,793
Costs and expenses:
Cost of revenues	61	52	158	139
Sales and marketing	3,376	3,535	10,142	10,735
Research and development	3,116	2,951	9,138	10,229
General and administrative	10,753	9,654	41,885	30,745
Total costs and expenses	17,306	16,192	61,323	51,848
Operating income (loss)	(5,443)	10,114	(33,206)	(4,055)
Interest and other income	200	664	504	909
Income (loss) from continuing operations before benefit (provision) for income taxes	(5,243)	10,778	(32,702)	(3,146)
Benefit (provision) for income taxes	(44)	(3,760)	(295)	1,264
Income (loss) from continuing operations	(5,287)	7,018	(32,997)	(1,882)
Income from discontinued operations, net of tax	0	0	0	649
Net income (loss)	$ (5,287)	$ 7,018	$ (32,997)	$ (1,233)
Basic net income (loss) per share:
Basic net loss per share - Continuing operations (in dollars per share)	$ (0.18)	$ 0.24	$ (1.13)	$ (0.07)
Basic net loss per share - Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.02
Basic net loss per share (in dollars per share)	$ (0.18)	$ 0.24	$ (1.13)	$ (0.05)
Shares used in computation of basic net income (loss) per share (weighted average common shares outstanding)	29,245	28,849	29,155	28,726
Diluted net income (loss) per share:
Diluted net loss per share - Continuing operations (in dollars per share)	$ (0.18)	$ 0.24	$ (1.13)	$ (0.07)
Diluted net loss per share - Discontinued operations (in dollars per share)	0.00	0.00	0.00	0.02
Diluted net loss per share (in dollars per share)	$ (0.18)	$ 0.24	$ (1.13)	$ (0.05)
Shares used in computation of diluted net income (loss) per share (weighted average common shares outstanding)	29,245	29,298	29,155	28,726
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ 10	$ (23)	$ (14)	$ 32
Total other comprehensive income (loss)	10	(23)	(14)	32
Total comprehensive income (loss)	$ (5,277)	$ 6,995	$ (33,011)	$ (1,201)