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CONDENSED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenues:        
Total revenues $ 4,986,000 $ 1,173,000 $ 7,980,000 $ 9,068,000
Operating expenses:        
Cost of revenue 732,000 0 955,000 1,000,000
Research and development 7,467,000 23,695,000 26,059,000 70,172,000
Selling, general and administrative 18,667,000 19,714,000 56,868,000 56,969,000
Total operating expenses 26,866,000 43,409,000 83,882,000 128,141,000
Loss from operations (21,880,000) (42,236,000) (75,902,000) (119,073,000)
Interest expense (886,000) (1,216,000) (2,409,000) (3,518,000)
Non-cash interest expense related to the sale of future royalties (831,000) 0 (841,000) 0
Other income (expense), net 704,000 (134,000) 1,258,000 664,000
Loss before provision for income taxes (22,893,000) (43,586,000) (77,894,000) (121,927,000)
Provision for income taxes 0 1,000 8,000 4,000
Net loss $ (22,893,000) $ (43,587,000) $ (77,902,000) $ (121,931,000)
Net loss per common share - basic (in dollars per share) $ (0.14) $ (0.42) $ (0.53) $ (1.21)
Net loss per common share - diluted (in dollars per share) $ (0.14) $ (0.42) $ (0.53) $ (1.21)
Shares used in computing net loss per share - basic (in shares) 165,104,789 104,144,606 147,319,818 100,480,156
Shares used in computing net loss per share - diluted (in shares) 165,104,789 104,144,606 147,319,818 100,480,156
Comprehensive loss:        
Net loss $ (22,893,000) $ (43,587,000) $ (77,902,000) $ (121,931,000)
Unrealized (losses) gains on available-for-sale securities (5,000) (1,000) (108,000) 7,000
Comprehensive loss (22,898,000) (43,588,000) (78,010,000) (121,924,000)
Product sales, net        
Revenues:        
Total revenues 4,885,000 0 6,899,000 0
Product supply revenue        
Revenues:        
Total revenues 92,000 285,000 1,058,000 411,000
Licensing revenue        
Revenues:        
Total revenues 9,000 2,000 23,000 5,007,000
Collaborative development revenue        
Revenues:        
Total revenues $ 0 $ 886,000 $ 0 $ 3,650,000