CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenue	$ 110,979	$ 35,013	$ 57,086
Costs and expenses:
Cost of revenues	218	197	197
Sales and marketing	6,118	13,516	14,613
Research and development	9,727	11,759	13,388
General and administrative	41,815	53,343	44,151
Restructuring costs	0	1,620	0
Total costs and expenses	57,878	80,435	72,349
Operating income (loss)	53,101	(45,422)	(15,263)
Interest and other income	1,832	337	817
Other income (expense)	(198)	274	(63)
Income (loss) from continuing operations before provision for income taxes	54,735	(44,811)	(14,509)
Provision for income taxes from continuing operations	(392)	(480)	(25,521)
Income (loss) from continuing operations	54,343	(45,291)	(40,030)
Income from discontinued operations, net of tax	0	0	649
Net income (loss)	$ 54,343	$ (45,291)	$ (39,381)
Basic net income (loss) per share:
Continuing operations (in dollars per share)	$ 1.78	$ (1.55)	$ (1.39)
Discontinued operations (in dollars per share)	0.00	0.00	0.02
Total (in dollars per share)	$ 1.78	$ (1.55)	$ (1.37)
Shares used in calculating basic net income (loss) per share (in shares)	30,459	29,179	28,759
Diluted net income (loss) per share:
Continuing operations (in dollars per share)	$ 1.73	$ (1.55)	$ (1.39)
Discontinued operations (in dollars per share)	0.00	0.00	0.02
Total (in dollars per shares)	$ 1.73	$ (1.55)	$ (1.37)
Shares used in calculating diluted net income (loss) per share (in shares)	31,407	29,179	28,759
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ 17	$ (16)	$ 8
Foreign currency translation adjustments	0	0	21
Total other comprehensive income (loss)	17	(16)	29
Total comprehensive income (loss)	54,360	(45,307)	(39,352)
Royalty and license
Revenues:
Revenue	110,557	34,089	56,030
Development, services, and other
Revenues:
Revenue	$ 422	$ 924	$ 1,056