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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 29, 2017
Sep. 30, 2016
Sep. 29, 2017
Sep. 30, 2016
Net sales $ 23,473 $ 20,052 $ 65,759 $ 60,295
Cost of sales 6,624 5,180 18,859 17,804
Gross profit 16,849 14,872 46,900 42,491
General and administrative 4,946 4,985 15,065 18,378
Marketing and selling 6,431 7,149 20,282 22,006
Research and development 4,429 4,453 13,924 16,018
Total operating expenses 15,806 16,587 49,271 56,402
Operating income (loss) 1,043 (1,715) (2,371) (13,911)
Other income (expense):        
Interest expense, net (27) (29) (88) (85)
Gain (loss) on foreign currency transactions 444 (29) 738 13
Royalty income 141 134 400 507
Other income (expense), net (19) (68) 17 (150)
Other income, net 539 8 1,067 285
Income (loss) before provision (benefit) for income taxes 1,582 (1,707) (1,304) (13,626)
Provision (benefit) for income taxes 409 71 697 (1,664)
Net income (loss) $ 1,173 $ (1,778) $ (2,001) $ (11,962)
Net income (loss) per share - basic (in dollars per share) $ 0.03 $ (0.04) $ (0.05) $ (0.30)
Net income (loss) per share - diluted (in dollars per share) $ 0.03 $ (0.04) $ (0.05) $ (0.30)
Weighted average shares outstanding - basic (in shares) 41,110 40,486 40,939 40,227
Weighted average shares outstanding - diluted (in shares) 42,104 40,486 40,939 40,227