Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue	$ 3,191	$ 2,263
Cost of revenue	1,284	852
Gross profit	1,907	1,411
Operating expenses:
Sales and marketing	412	414
Research and development	182	303
General and administrative	331	295
Operating income	982	399
Interest expense, net	(35)	(53)
Net income	947	346
Preferred stock dividend accrued	(34)	(36)
Net income attributable to common stockholders	$ 913	$ 310
Net income per share attributable to common stockholders:
Basic (in dollars per share)	$ 0.07	$ 0.02
Diluted (in dollars per share)	$ 0.06	$ 0.02
Weighted average common shares outstanding:
Basic (in shares)	13,408	12,946
Diluted (in shares)	15,323	14,730