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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2021
Jul. 03, 2020
Jul. 02, 2021
Jul. 03, 2020
Income Statement [Abstract]        
Net sales $ 62,367,000 $ 35,194,000 $ 113,119,000 $ 70,381,000
Cost of sales 13,164,000 10,764,000 24,774,000 21,191,000
Gross profit 49,203,000 24,430,000 88,345,000 49,190,000
Selling, general and administrative expenses:        
General and administrative 11,441,000 7,848,000 21,653,000 15,817,000
Selling and marketing 18,853,000 10,326,000 32,054,000 21,354,000
Research and development 8,260,000 7,311,000 16,519,000 14,209,000
Total selling, general and administrative expenses 38,554,000 25,485,000 70,226,000 51,380,000
Operating income (loss) 10,649,000 (1,055,000) 18,119,000 (2,190,000)
Other income (expense), net:        
Interest income (expense), net (5,000) 20,000 (12,000) 236,000
Gain (loss) on foreign currency transactions (131,000) 388,000 (1,430,000) (80,000)
Royalty income 151,000 52,000 311,000 146,000
Other income (expense), net 51,000 (21,000) (34,000) (20,000)
Total other income (expense), net 66,000 439,000 (1,165,000) 282,000
Income (loss) before income taxes 10,715,000 (616,000) 16,954,000 (1,908,000)
Provision (benefit) for income taxes 2,148,000 556,000 3,395,000 (602,000)
Net income (loss) $ 8,567,000 $ (1,172,000) $ 13,559,000 $ (1,306,000)
Net income (loss) per share:        
Basic $ 0.18 $ (0.03) $ 0.29 $ (0.03)
Diluted $ 0.17 $ (0.03) $ 0.27 $ (0.03)
Weighted average shares outstanding:        
Basic 47,099 45,354 46,858 45,152
Diluted 49,491 45,354 49,373 45,152