Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 1,588	$ 3,860	$ 5,039	$ 11,071
Cost of revenue	652	1,465	2,050	4,339
Gross profit	936	2,395	2,989	6,732
Operating expenses:
Sales and marketing	885	356	1,880	813
Research and development	1,081	297	2,741	775
General and administrative	377	277	962	930
Operating income (loss)	(1,407)	1,465	(2,594)	4,214
Interest income	0	0	8	0
Interest expense	(2)	(1)	(4)	(45)
Net income (loss)	(1,409)	1,464	(2,590)	4,169
Preferred stock dividends accrued	(13)	(35)	(79)	(104)
Net income (loss) attributable to common stockholders	$ (1,422)	$ 1,429	$ (2,669)	$ 4,065
Net income (loss) per share attributable to common stockholders:
Basic (in dollars per share)	$ (0.10)	$ 0.11	$ (0.19)	$ 0.30
Diluted (in dollars per share)	$ (0.10)	$ 0.09	$ (0.19)	$ 0.27
Weighted average common shares outstanding:
Basic (in shares)	14,450	13,523	13,981	13,466
Diluted (in shares)	14,450	15,371	13,981	15,314