STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Revenue:
Product revenue	$ 12,129	$ 10,720
Other revenue	342	63
Total revenue	12,471	10,783
Operating expense:
Cost of revenue	8,621	7,543
Gross profit	3,850	3,240
Research and development expense	1,736	1,554
Selling, general and administrative expense	2,886	2,954
Loss from operations	(772)	(1,268)
Interest expense	(34)	(15)
Other, net	17
Loss before provision for income taxes	(789)	(1,283)
Net loss	$ (789)	$ (1,283)
Net loss per share - basic and diluted	$ (0.03)	$ (0.04)
Weighted average number of basic and diluted common shares outstanding	31,335,956	30,911,869