Unaudited Condensed 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	$ 1,655	$ 4,020	$ 3,450	$ 7,211
Cost of revenue	651	1,590	1,398	2,874
Gross profit	1,004	2,430	2,052	4,337
Operating expenses:
Sales and marketing	485	46	995	458
Research and development	907	296	1,660	477
General and administrative	326	321	582	652
Operating income (loss)	(714)	1,767	(1,185)	2,750
Interest income	1		7
Interest expense	(2)	(9)	(2)	(44)
Net income (loss)	(715)	1,758	(1,180)	2,706
Preferred stock dividends accrued	(33)	(35)	(66)	(69)
Net income (loss) attributable to common stockholders	$ (748)	$ 1,723	$ (1,246)	$ 2,637
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.05)	$ 0.13	$ (0.09)	$ 0.20
Diluted (in dollars per share)	$ (0.05)	$ 0.11	$ (0.09)	$ 0.17
Weighted average common shares outstanding:
Basic (in shares)	13,784	13,523	13,743	13,466
Diluted (in shares)	13,784	15,371	13,743	15,314