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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Income Statement [Abstract]        
Net sales $ 18,165,000 $ 20,266,000 $ 51,770,000 $ 55,728,000
Cost of sales 10,488,000 13,668,000 28,534,000 36,485,000
Gross profit 7,677,000 6,598,000 23,236,000 19,243,000
Operating expenses:        
Research and development 8,889,000 9,568,000 26,474,000 28,395,000
Selling, general, and administrative 8,831,000 7,119,000 24,343,000 21,090,000
Total operating expenses 17,720,000 16,687,000 50,817,000 49,485,000
Loss from operations (10,043,000) (10,089,000) (27,581,000) (30,242,000)
Other income, net 1,044,000 664,000 1,820,000 797,000
Loss before income taxes (8,999,000) (9,425,000) (25,761,000) (29,445,000)
Provision for income taxes 3,000 13,000 21,000 25,000
Net loss (9,002,000) (9,438,000) (25,782,000) (29,470,000)
Deemed dividends 0 (305,000) 0 (2,724,000)
Net loss attributable to common stockholder $ (9,002,000) $ (9,743,000) $ (25,782,000) $ (32,194,000)
Net loss per share attributable to common stockholders, basic $ (0.72) $ (26.03) $ (5.73) $ (87.51)
Net loss per share attributable to common stockholders, diluted $ (0.72) $ (26.03) $ (5.73) $ (87.51)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic 12,464,236 374,270 4,495,701 367,888
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted 12,464,236 374,270 4,495,701 367,888
Comprehensive loss:        
Currency translation adjustment $ (14,000) $ 56,000 $ 66,000 $ 107,000
Comprehensive loss (9,016,000) (9,382,000) (25,716,000) (29,363,000)
Deemed dividends 0 (305,000) 0 (2,724,000)
Comprehensive loss attributable to common stockholders $ (9,016,000) $ (9,687,000) $ (25,716,000) $ (32,087,000)