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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

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