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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Revenues:        
Total revenues $ 7,979 $ 21,323 $ 25,052 $ 34,305
Costs and operating expenses:        
Cost of product revenue 3,462 3,178 8,317 7,698
Research and development 11,413 17,334 22,659 33,988
Selling, general and administrative 15,671 13,365 28,531 28,765
Restructuring charges 0 72 0 145
Asset impairment and other charges 165 0 165 0
Total costs and operating expenses 30,711 33,949 59,672 70,596
Loss from operations (22,732) (12,626) (34,620) (36,291)
Interest income 972 1,121 1,881 2,209
Interest and other expense, net (985) (9) (1,500) (33)
Loss before income taxes (22,745) (11,514) (34,239) (34,115)
Provision for income taxes 10 9 21 25
Net loss $ (22,755) $ (11,523) $ (34,260) $ (34,140)
Net loss per share, basic (in dollars per share) $ (0.32) $ (0.17) $ (0.49) $ (0.51)
Net loss per share, diluted (in dollars per share) $ (0.32) $ (0.17) $ (0.49) $ (0.51)
Weighted average common stock shares used in computing net loss per share, basic (in shares) 70,376 67,573 70,115 66,756
Weighted average common stock shares used in computing net loss per share, diluted (in shares) 70,376 67,573 70,115 66,756
Product revenue        
Revenues:        
Total revenues $ 6,259 $ 11,048 $ 15,810 $ 19,412
Research and development revenue        
Revenues:        
Total revenues $ 1,720 $ 10,275 $ 9,242 $ 14,893