CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Total revenue	$ 1,890	$ 3,012	$ 5,409	$ 6,744
Costs and expenses:
Cost of services	164	321	334	839
Research and development	2,422	2,091	4,694	3,851
Selling and marketing	1,180	909	2,466	1,736
General and administrative	1,825	874	2,963	1,595
Total costs and expenses	5,591	4,195	10,457	8,021
Patent related income				49
Operating loss	(3,701)	(1,183)	(5,048)	(1,228)
Interest income	19	278	167	553
Income (loss) before provision for (benefit from) income taxes	(3,682)	(905)	(4,881)	(675)
Provision for (benefit from) income taxes	(541)	33	(680)	35
Net loss	$ (3,141)	$ (938)	$ (4,201)	$ (710)
Net loss per share - basic (in dollars per share)	$ (0.15)	$ (0.04)	$ (0.20)	$ (0.03)
Net loss per share - diluted (in dollars per share)	$ (0.15)	$ (0.04)	$ (0.20)	$ (0.03)
Weighted-average shares - basic (in shares)	21,470	21,537	21,495	21,551
Weighted-average shares - diluted (in shares)	21,470	21,537	21,495	21,551
Software licenses
Revenue:
Total revenue	$ 409	$ 1,189	$ 2,381	$ 2,725
Software maintenance
Revenue:
Total revenue	1,382	1,320	2,741	2,675
Services
Revenue:
Total revenue	$ 99	$ 503	$ 287	$ 1,344