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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 30, 2018
Mar. 31, 2017
Net sales $ 27,093 $ 20,350
Cost of sales 7,662 5,773
Gross profit 19,431 14,577
Selling, general and administrative expenses:    
General and administrative 6,209 5,348
Marketing and selling 7,380 6,530
Research and development 5,043 4,783
Total selling, general and administrative expenses 18,632 16,661
Operating income (loss) 799 (2,084)
Other income (expense):    
Interest expense, net (12) (28)
Loss on foreign currency transactions (77) (86)
Royalty income [1] 157 131
Other income, net 17 5
Other income, net 85 22
Income (loss) before provision for income taxes 884 (2,062)
Provision for income taxes 301 141
Net income (loss) $ 583 $ (2,203)
Net income (loss) per share - basic (in dollars per share) $ 0.01 $ (0.05)
Net income (loss) per share - diluted (in dollars per share) $ 0.01 $ (0.05)
Weighted average shares outstanding - basic (in shares) 41,410 40,749
Weighted average shares outstanding - diluted (in shares) 43,087 40,749
[1] Shown as a separate line item in other income, net on the Condensed Consolidated Statements of Operations.