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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Sales $ 36,627 $ 29,520 $ 27,681
Cost of sales 18,712 16,963 18,689
Gross profit 17,915 12,557 8,992
Other costs and expenses:      
Research and development 2,618 2,160 1,416
Professional services 1,486 1,484 1,016
Salaries and related costs 9,038 7,482 5,723
Selling, general and administrative 8,565 8,417 6,686
Total other costs and expenses 21,707 19,543 14,841
Loss from operations (3,792) (6,986) (5,849)
Interest expense, net (158) (158) (151)
Change in fair value of derivative liabilities, net 64 1,799 (7,285)
Total other (expense) income, net (94) 1,641 (7,436)
Loss before income taxes (3,886) (5,345) (13,285)
Income tax expense 64 25 3,997
Net loss (3,950) (5,370) (17,282)
Accretion on convertible preferred stock 0 (222) (932)
Gain on conversion of warrants and preferred shares, net 0 13,956 0
Net (loss) income attributable to common shareholders $ (3,950) $ 8,364 $ (18,214)
(Loss) income per share attributable to common shareholders      
Basic (in dollars per share) $ (0.14) $ 0.34 $ (1.03)
Diluted (in dollars per share) $ (0.15) $ 0.24 $ (1.03)
Weighted average number of shares outstanding - basic (in shares) 27,433 24,333 17,756
Weighted average number of shares outstanding - dilutive (in shares) 27,449 27,747 17,756