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Condensed Statements of Operations (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenues:        
Total net revenues $ 9,074 $ 11,997 $ 17,040 $ 17,301
Cost of sales:        
Total cost of sales 3,448 2,315 6,407 4,273
Gross profit 5,626 9,682 10,633 13,028
Operating expenses:        
Research and development 2,970 1,125 3,621 1,660
General and administrative 5,591 4,674 10,747 10,019
Total operating expenses 8,561 5,799 14,368 11,679
Income (loss) from operations (2,935) 3,883 (3,735) 1,349
Other income (expense):        
Other income 0 800 0 800
Interest expense, net (52) (124) (63) (250)
Total other income (expense) (52) 676 (63) 550
Income (loss) before income tax expense (2,987) 4,559 (3,798) 1,899
Income tax expense 54 0 54 0
Net income (loss) $ (3,041) $ 4,559 $ (3,852) $ 1,899
Net income (loss) per share, basic (in dollars per share) $ (0.12) $ 0.18 $ (0.15) $ 0.07
Weighted average number of common shares outstanding, basic (in shares) 25,778 25,593 25,771 25,560
Net income (loss) per share, diluted (in dollars per share) $ (0.12) $ 0.18 $ (0.15) $ 0.07
Weighted average number of common shares outstanding, diluted (in shares) 25,778 25,983 25,771 25,949
License [Member]        
Revenues:        
Total net revenues $ 0 $ 5,500 $ 0 $ 5,500
Cost of sales:        
Total cost of sales 0 0 0 0
Product Sales and Royalties [Member]        
Revenues:        
Total net revenues 9,074 6,497 17,040 11,801
Cost of sales:        
Total cost of sales $ 3,448 $ 2,315 $ 6,407 $ 4,273