CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Total revenue	$ 12,509	$ 14,193
Operating expense:
Cost of revenue	9,893	10,903
Gross profit	2,616	3,290
Research and development expense	1,870	2,057
Selling, general and administrative expense	3,542	3,256
Loss from operations	(2,796)	(2,023)
Interest expense	(210)	(58)
Loss before provision for income taxes	(3,006)	(2,081)
Provision for income taxes
Net loss	$ (3,006)	$ (2,081)
Net loss per share-basic and diluted (in dollars per share)	$ (0.08)	$ (0.06)
Weighted average number of basic and diluted common shares outstanding (in shares)	36,596,372	33,871,815
Product Revenue [Member]
Revenue:
Total revenue	$ 11,852	$ 14,040
Other Revenue [Member]
Revenue:
Total revenue	$ 657	$ 153