Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Product sales	$ 6,701	$ 5,178	$ 12,471	$ 8,993
Cost of product sales	1,958	1,537	3,606	2,901
Gross profit	4,743	3,641	8,865	6,092
Operating expenses
Research and development	739	325	1,111	671
Sales and marketing	928	641	1,776	1,253
General and administrative	2,118	1,390	4,321	2,744
Acquisition costs	39		247
Total operating expenses	3,824	2,356	7,455	4,668
Operating income	919	1,285	1,410	1,424
Other income (expenses), net
Interest income	137	32	307	41
Interest expense	(1)	(1)	(4)	(1)
Loss from equity-method investment in SAVSU	(217)	(177)	(448)	(321)
Total other income (expenses), net	(81)	(146)	(145)	(281)
Income before provision for income taxes	838	1,139	1,265	1,143
Income taxes
Net income	838	1,139	1,265	1,143
Less: Preferred stock dividends		(93)		(200)
Net income attributable to common stockholders	$ 838	$ 1,046	$ 1,265	$ 943
Basic net income per common share (in dollars per share)	$ 0.04	$ 0.07	$ 0.07	$ 0.06
Diluted net income per common share (in dollars per share)	$ 0.03	$ 0.05	$ 0.05	$ 0.05
Basic shares used to compute earnings per share (in shares)	18,819,459	15,180,169	18,734,401	14,642,378
Diluted shares used to compute earnings per share (in shares)	24,539,299	20,374,358	24,439,959	19,063,595