CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenue	$ 5,122	$ 85,416
Costs and expenses:
Cost of revenues	15	35
Sales and marketing	1,609	1,220
Research and development	2,302	2,820
General and administrative	12,695	11,236
Total costs and expenses	16,621	15,311
Operating income (loss)	(11,499)	70,105
Interest and other income	598	231
Income (loss) before provision for income taxes	(10,901)	70,336
Provision for income taxes	(115)	(453)
Net income (loss)	$ (11,016)	$ 69,883
Basic net (loss) per share (in dollars per share)	$ (0.35)	$ 2.35
Shares used in calculating basic net income (loss) per share (in shares)	31,089	29,700
Diluted net income (loss) per share (in dollars per share)	$ (0.35)	$ 2.29
Shares used in computation of diluted net income (loss) per share (in shares)	31,089	30,566
Change in unrealized gains on short-term investments
Total Other Comprehensive Income	$ 6	$ 5
Total Other Comprehensive Income	6	5
Total Comprehensive Income (loss)	(11,010)	69,888
Royalty and license
Revenues:
Revenue	5,047	85,335
Development, services, and other revenue
Revenues:
Revenue	$ 75	$ 81