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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Income Statement [Abstract]        
Net sales $ 17,873,000 $ 20,252,000 $ 33,605,000 $ 35,462,000
Cost of sales 10,703,000 13,841,000 18,046,000 22,817,000
Gross profit 7,170,000 6,411,000 15,559,000 12,645,000
Operating expenses:        
Research and development 8,898,000 9,391,000 17,585,000 18,827,000
Selling, general, and administrative 7,069,000 7,983,000 15,512,000 13,971,000
Total operating expenses 15,967,000 17,374,000 33,097,000 32,798,000
Loss from operations (8,797,000) (10,963,000) (17,538,000) (20,153,000)
Other income 315,000 337,000 776,000 133,000
Loss before income taxes (8,482,000) (10,626,000) (16,762,000) (20,020,000)
Provision for income taxes 14,000 7,000 18,000 12,000
Net loss (8,496,000) (10,633,000) (16,780,000) (20,032,000)
Deemed dividends 0 (2,044,000) 0 (2,419,000)
Net loss attributable to common stockholder $ (8,496,000) $ (12,677,000) $ (16,780,000) $ (22,451,000)
Net loss per share attributable to common stockholders, basic $ (18.89) $ (34.59) $ (37.59) $ (61.57)
Net loss per share attributable to common stockholders, diluted $ (18.89) $ (34.59) $ (37.59) $ (61.57)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic 449,785 366,509 446,390 364,662
Weighted-average shares used in computing net loss per share attributable to common stockholders, diluted 449,785 366,509 446,390 364,662
Comprehensive loss:        
Currency translation adjustment $ 110,000 $ (99,000) $ 80,000 $ 51,000
Comprehensive loss (8,386,000) (10,732,000) (16,700,000) (19,981,000)
Deemed dividends 0 (2,044,000) 0 (2,419,000)
Comprehensive loss attributable to common stockholders $ (8,386,000) $ (12,776,000) $ (16,700,000) $ (22,400,000)