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Condensed Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Total revenue $ 13,201 $ 10,636 $ 26,339 $ 25,066
Total cost of sales 6,433 5,420 12,818 11,690
Gross profit 6,768 5,216 13,521 13,376
Operating expenses:        
Research and development 3,580 3,457 6,936 6,875
General and administrative 3,642 3,254 7,480 7,290
Sales and marketing 1,507 1,324 2,998 2,630
Total operating expenses 8,729 8,035 17,414 16,795
Loss from operations (1,961) (2,819) (3,893) (3,419)
Interest income 423 423 831 862
Other income (expense), net 842 (30) 1,230 (71)
Net loss before income taxes (696) (2,426) (1,832) (2,628)
Income tax expense 26 (76) (4) (76)
Net loss and comprehensive loss $ (670) $ (2,502) $ (1,836) $ (2,704)
Net loss per common share, Basic (in dollars per share) $ (0.03) $ (0.12) $ (0.08) $ (0.13)
Net loss per common share, Diluted (in dollars per share) $ (0.03) $ (0.12) $ (0.08) $ (0.13)
Weighted-average shares of common stock outstanding, Basic (in shares) 22,504,957 21,566,863 22,347,411 21,409,611
Weighted average shares of common stock outstanding, Diluted (in shares) 22,504,957 21,566,863 22,347,411 21,409,611
Product sales        
Total revenue $ 11,091 $ 9,887 $ 22,117 $ 20,747
Total cost of sales 6,166 5,235 12,195 11,238
Licensing, royalty, patent, and other revenue        
Total revenue 2,110 749 4,222 4,319
Total cost of sales $ 267 $ 185 $ 623 $ 452