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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Income Statement [Abstract]        
Net sales $ 35,194,000 $ 39,664,000 $ 70,381,000 $ 72,247,000
Cost of sales 10,764,000 9,765,000 21,191,000 18,168,000
Gross profit 24,430,000 29,899,000 49,190,000 54,079,000
Selling, general and administrative expenses:        
General and administrative 7,848,000 7,508,000 15,817,000 14,345,000
Marketing and selling 10,326,000 11,682,000 21,354,000 21,825,000
Research and development 7,311,000 6,098,000 14,209,000 11,733,000
Total selling, general and administrative expenses 25,485,000 25,288,000 51,380,000 47,903,000
Operating income (loss) (1,055,000) 4,611,000 (2,190,000) 6,176,000
Other income (expense), net:        
Interest income, net 20,000 259,000 236,000 530,000
Gain (loss) on foreign currency transactions 388,000 11,000 (80,000) (237,000)
Royalty income 52,000 163,000 146,000 334,000
Other income (expense), net (21,000) 1,000 (20,000) 98,000
Total other income, net 439,000 434,000 282,000 725,000
Income (loss) before income taxes (616,000) 5,045,000 (1,908,000) 6,901,000
Provision (benefit) for income taxes 556,000 1,131,000 (602,000) 1,620,000
Net income (loss) $ (1,172,000) $ 3,914,000 $ (1,306,000) $ 5,281,000
Net income (loss) per share:        
Basic $ (0.03) $ 0.09 $ (0.03) $ 0.12
Diluted $ (0.03) $ 0.08 $ (0.03) $ 0.11
Weighted average shares outstanding:        
Basic 45,354 44,479 45,152 44,357
Diluted 45,354 46,733 45,152 46,842