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Condensed Statements of Operations and Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Total revenue $ 14,060 $ 12,093 $ 40,399 $ 37,159
Total cost of sales 6,854 6,141 19,672 17,831
Gross profit 7,206 5,952 20,727 19,328
Operating expenses:        
Research and development 3,583 3,384 10,519 10,259
General and administrative 3,690 3,363 11,170 10,653
Sales and marketing 1,478 1,320 4,476 3,950
Total operating expenses 8,751 8,067 26,165 24,862
Loss from operations (1,545) (2,115) (5,438) (5,534)
Interest income 432 463 1,263 1,325
Other income, net 1,164 3,933 2,394 3,862
Net income (loss) before income taxes 51 2,281 (1,781) (347)
Income tax benefit (expense) 3 (10) (1) (86)
Net income (loss) and comprehensive income (loss) $ 54 $ 2,271 $ (1,782) $ (433)
Net loss per common share, basic (in dollars per share) $ 0.00 $ 0.10 $ (0.08) $ (0.02)
Net loss per common share, diluted (in dollars per share) $ 0.00 $ 0.10 $ (0.08) $ (0.02)
Weighted-average shares of common stock outstanding, Basic (in shares) 22,669,872 21,767,380 22,456,079 21,529,738
Weighted average shares of common stock outstanding, Diluted (in shares) 23,147,119 21,985,175 22,456,079 21,529,738
Product sales        
Total revenue $ 12,690 $ 10,443 $ 34,807 $ 31,190
Total cost of sales 6,628 5,751 18,823 16,989
Licensing, royalty, patent, and other revenue        
Total revenue 1,370 1,650 5,592 5,969
Total cost of sales $ 226 $ 390 $ 849 $ 842