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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Income Statement [Abstract]        
Net sales $ 39,055 $ 31,770 $ 111,302 $ 92,768
Cost of sales 10,004 7,910 28,172 24,250
Gross profit 29,051 23,860 83,130 68,518
Selling, general and administrative expenses:        
General and administrative 7,098 6,087 21,443 18,054
Marketing and selling 12,463 10,620 34,288 28,733
Research and development 6,156 5,570 17,889 16,323
Total selling, general and administrative expenses 25,717 22,277 73,620 63,110
Operating income 3,334 1,583 9,510 5,408
Other income (expense), net:        
Interest income (expense), net 266 (29) 796 (65)
Gain (loss) on foreign currency transactions (584) 52 (821) (545)
Royalty income 106 159 440 465
Other income, net 26 40 124 61
Total other income (expense), net (186) 222 539 (84)
Income before income taxes 3,148 1,805 10,049 5,324
Provision for income taxes 760 346 2,380 1,452
Net income $ 2,388 $ 1,459 $ 7,669 $ 3,872
Net income per share:        
Basic $ 0.05 $ 0.03 $ 0.17 $ 0.09
Diluted $ 0.05 $ 0.03 $ 0.16 $ 0.09
Weighted average shares outstanding:        
Basic 44,563 43,054 44,426 42,065
Diluted 46,857 46,025 46,848 44,618