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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 29, 2017
Dec. 30, 2016
Jan. 01, 2016
Net sales $ 90,611 $ 82,432 $ 77,123
Cost of sales 26,331 24,063 24,400
Gross profit 64,280 58,369 52,723
Selling, general and administrative expenses:      
General and administrative 20,665 22,252 19,604
Marketing and selling 28,130 28,478 23,695
Research and development 19,116 20,294 14,761
Operating loss (3,631) (12,655) (5,337)
Other income (expense), net:      
Interest expense, net (112) (112) (78)
Gain (loss) on foreign currency transactions 819 (147) (949)
Royalty income 581 618 740
Other income (expense), net 47 (148) 19
Other income (expense), net 1,335 211 (268)
Loss before provision (benefit) for income taxes (2,296) (12,444) (5,605)
Provision (benefit) for income taxes (157) (315) 928
Net loss $ (2,139) $ (12,129) $ (6,533)
Net loss per share - basic and diluted $ (0.05) $ (0.30) $ (0.17)
Weighted average shares outstanding - basic and diluted 41,004 40,329 39,260