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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue:    
Total revenue $ 14,193 $ 12,471
Operating expense:    
Cost of revenue 10,903 8,621
Gross profit 3,290 3,850
Research and development expense 2,057 1,736
Selling, general and administrative expense 3,256 2,886
Loss from operations (2,023) (772)
Interest expense (58) (34)
Other, net   17
Loss before provision for income taxes (2,081) (789)
Provision for income taxes 0 0
Net loss $ (2,081) $ (789)
Net loss per share-basic and diluted (in dollar per share) $ (0.06) $ (0.03)
Weighted average number of basic and diluted common shares outstanding (in shares) 33,871,815 31,335,956
Product Revenue [Member]    
Revenue:    
Total revenue $ 14,040 $ 12,129
Other Revenue [Member]    
Revenue:    
Total revenue $ 153 $ 342