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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2017
Apr. 01, 2016
Net sales $ 20,350 $ 19,269
Cost of sales 5,773 6,276
Gross profit 14,577 12,993
General and administrative 5,359 8,465
Marketing and selling 6,530 7,675
Research and development 4,783 6,906
Operating loss (2,095) (10,053)
Other income (expense):    
Interest expense, net (28) (28)
Gain (loss) on foreign currency transactions (86) 458
Royalty income 131 22
Other income (expense), net 16 (44)
Total other income, net 33 408
Loss before income tax provision (benefit) (2,062) (9,645)
Income tax provision (benefit) 141 (1,604)
Net loss $ (2,203) $ (8,041)
Net loss per share - basic and diluted $ (0.05) $ (0.2)
Weighted average shares outstanding - basic and diluted 40,749 39,983