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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Jun. 29, 2018
Jun. 30, 2017
Net sales $ 33,905 $ 21,936 $ 60,998 $ 42,286
Cost of sales 8,678 6,462 16,340 12,235
Gross profit 25,227 15,474 44,658 30,051
Selling, general and administrative expenses:        
General and administrative 6,196 4,685 11,967 9,664
Marketing and selling 10,659 7,342 18,113 13,978
Research and development 5,346 4,767 10,753 9,824
Total selling, general and administrative expenses 22,201 16,794 40,833 33,466
Operating income (loss) 3,026 (1,320) 3,825 (3,415)
Other income (expense):        
Interest expense, net (24) (33) (36) (61)
Gain (loss) on foreign currency transactions (520) 380 (597) 294
Royalty income [1] 149 128 306 259
Other income, net 4 20 21 36
Other income (expense), net (391) 495 (306) 528
Income (loss) before income taxes 2,635 (825) 3,519 (2,887)
Income tax provision 805 146 1,106 287
Net income (loss) $ 1,830 $ (971) $ 2,413 $ (3,174)
Net income (loss) per share:        
Basic (in dollars per share) $ 0.04 $ (0.02) $ 0.06 $ (0.08)
Diluted (in dollars per share) $ 0.04 $ (0.02) $ 0.06 $ (0.08)
Weighted average shares outstanding:        
Basic (in shares) 41,723 40,933 41,568 40,841
Diluted (in shares) 43,999 40,933 43,654 40,841
[1] Shown as a separate line item in other income, net on the Condensed Consolidated Statements of Operations.