CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues:
Revenue	$ 6,257	$ 5,122
Costs and expenses:
Cost of revenues	44	15
Sales and marketing	1,716	1,609
Research and development	1,689	2,302
General and administrative	7,356	12,695
Total costs and expenses	10,805	16,621
Operating loss	(4,548)	(11,499)
Interest and other income (loss)	(228)	598
Loss before provision for income taxes	(4,776)	(10,901)
Provision for income taxes	(52)	(115)
Net loss	$ (4,828)	$ (11,016)
Basic net loss per share (in dollars per share)	$ (0.16)	$ (0.35)
Shares used in calculating basic net loss per share (in shares)	31,006	31,089
Diluted net loss per share (in dollars per share)	$ (0.16)	$ (0.35)
Shares used in calculating diluted net loss per share (in shares)	31,006	31,089
Other comprehensive income
Change in unrealized gains (loss) on short-term investments	$ (2)	$ 6
Total other comprehensive income (loss)	(2)	6
Total comprehensive income (loss)	(4,830)	(11,010)
Royalty and license
Revenues:
Revenue	6,182	5,047
Development, services, and other
Revenues:
Revenue	$ 75	$ 75