Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Royalty and license	$ 34,089	$ 56,030	$ 61,677
Development, services, and other	924	1,056	1,716
Total revenues	35,013	57,086	63,393
Costs and expenses:
Cost of revenues	197	197	460
Sales and marketing	13,516	14,613	14,674
Research and development	11,759	13,388	14,785
General and administrative	53,343	44,151	28,755
Restructuring costs	1,620	0	0
Total costs and expenses	80,435	72,349	58,674
Operating income (loss)	(45,422)	(15,263)	4,719
Interest and other income	337	817	177
Other expense	274	(63)	(447)
Income (loss) from continuing operations before provision for income taxes	(44,811)	(14,509)	4,449
Provision for income taxes from continuing operations	(480)	(25,521)	(1,591)
Income (loss) from continuing operations	(45,291)	(40,030)	2,858
Income from discontinued operations, net of tax	0	649	0
Net income (loss)	$ (45,291)	$ (39,381)	$ 2,858
Basic net income (loss) per share:
Basic net income (loss) per share - Continuing operations (in dollars per share)	$ (1.55)	$ (1.39)	$ 0.10
Basic net income (loss) per share - Discontinued operations (in dollars per share)	0.00	0.02	0.00
Basic net income per share (in dollars per share)	$ (1.55)	$ (1.37)	$ 0.10
Shares used in calculating basic net income per share (in shares)	29,179	28,759	28,097
Diluted net income (loss) per share:
Diluted net income (loss) per share - Continuing operations (in dollars per share)	$ (1.55)	$ (1.39)	$ 0.10
Diluted net income (loss) per share - Discontinued operations (in dollars per share)	0.00	0.02	0.00
Diluted net income per share (in dollars per shares)	$ (1.55)	$ (1.37)	$ 0.10
Shares used in computation of diluted net income (loss) per share (in shares)	29,179	28,759	29,015
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ (16)	$ 8	$ (16)
Foreign currency translation adjustments	0	21	0
Total other comprehensive income (loss)	(16)	29	(16)
Total comprehensive income (loss)	$ (45,307)	$ (39,352)	$ 2,842