CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenue	$ 5,668	$ 8,743	$ 11,925	$ 13,865
Costs and expenses:
Cost of revenues	62	40	106	55
Sales and marketing	1,255	1,579	2,971	3,188
Research and development	1,323	1,831	3,012	4,133
General and administrative	4,087	14,448	11,443	27,143
Total costs and expenses	6,727	17,898	17,532	34,519
Operating loss	(1,059)	(9,155)	(5,607)	(20,654)
Interest and other income	388	532	160	1,130
Loss before benefit from (provision for) income taxes	(671)	(8,623)	(5,447)	(19,524)
Benefit from (provision for) income taxes	(41)	3	(93)	(112)
Net loss	$ (712)	$ (8,620)	$ (5,540)	$ (19,636)
Basic net loss per share (in dollars per share)	$ (0.03)	$ (0.27)	$ (0.19)	$ (0.63)
Shares used in calculating basic net loss per share (in shares)	27,634	31,578	29,320	31,335
Diluted net loss per share (in dollars per share)	$ (0.03)	$ (0.27)	$ (0.19)	$ (0.63)
Shares used in calculating diluted net loss per share (in shares)	27,634	31,578	29,320	31,335
Other comprehensive income (loss)
Change in unrealized gains (loss) on short-term investments	$ 0	$ 16	$ (2)	$ 22
Total other comprehensive income (loss)	0	16	(2)	22
Total comprehensive loss	(712)	(8,604)	(5,542)	(19,614)
Royalty and license
Revenues:
Revenue	5,593	8,668	11,775	13,715
Development, services, and other
Revenues:
Revenue	$ 75	$ 75	$ 150	$ 150