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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 30, 2016
Jan. 01, 2016
Jan. 02, 2015
Net sales $ 82,432 $ 77,123 $ 74,987
Cost of sales 24,063 24,400 26,164
Gross profit 58,369 52,723 48,823
Selling, general and administrative expenses:      
General and administrative 22,252 19,604 18,287
Marketing and selling 28,478 23,695 25,879
Research and development 20,294 14,761 12,363
Other general and administrative expenses 0 0 321
Operating loss (12,655) (5,337) (8,027)
Other income (expense), net:      
Interest income 3 50 51
Interest expense (115) (128) (154)
Loss on foreign currency transactions (147) (949) (896)
Royalty income 618 740 355
Other income (expense), net (148) 19 26
Other income (expense), net 211 (268) (618)
Loss before provision (benefit) for income taxes (12,444) (5,605) (8,645)
Provision (benefit) for income taxes (315) 928 (253)
Net loss $ (12,129) $ (6,533) $ (8,392)
Net loss per share - basic and diluted (in dollars per share) $ (0.30) $ (0.17) $ (0.22)
Weighted average shares outstanding - basic and diluted (in shares) 40,329 39,260 38,091