CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Royalty and license	$ 85,335	$ 9,006
Development, services, and other	81	218
Total revenues	85,416	9,224
Costs and expenses:
Cost of revenues	35	43
Sales and marketing	1,220	3,305
Research and development	2,820	3,196
General and administrative	11,236	15,532
Total costs and expenses	15,311	22,076
Operating income (loss)	70,105	(12,852)
Interest and other income	231	139
Income (loss) before provision for income taxes	70,336	(12,713)
Provision for income taxes	(453)	(152)
Net income (loss)	$ 69,883	$ (12,865)
Basic net loss per share (in dollars per share)	$ 2.35	$ (0.44)
Shares used in calculating basic net income (loss) per share (in shares)	29,700	29,024
Diluted net loss per share (in dollars per share)	$ 2.29	$ (0.44)
Shares used in computation of diluted net income (loss) per share (in shares)	30,566	29,024
Other comprehensive income (loss), net of tax
Change in unrealized gains (losses) on short-term investments	$ 5	$ (22)
Total other comprehensive income (loss)	5	(22)
Total comprehensive income (loss)	$ 69,888	$ (12,887)