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Condensed Statements of Operations and Comprehensive Loss - USD ($)
shares in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Total revenues $ 2,171,000 $ 2,081,000 $ 3,998,000 $ 4,135,000
Operating expenses:        
Cost of product revenues $ 356,000 $ 359,000 $ 645,000 $ 747,000
Type of cost, good or service [extensible list] Product Revenue, Net [Member] Product Revenue, Net [Member] Product Revenue, Net [Member] Product Revenue, Net [Member]
Research and development $ 2,247,000 $ 7,946,000 $ 6,366,000 $ 16,539,000
Selling, general and administrative 2,972,000 3,827,000 6,108,000 7,922,000
Total operating expenses 5,575,000 12,132,000 13,119,000 25,208,000
Loss from operations (3,404,000) (10,051,000) (9,121,000) (21,073,000)
Other income (expense):        
Interest and other income 227,000 511,000 548,000 1,028,000
Interest and other expenses (445,000) (749,000) (974,000) (1,475,000)
Change in fair value of warrant liabilities (78,000) (892,000) (1,796,000) 1,585,000
Issuance cost for warrants       (1,200,000)
Loss on issuance of warrants       (2,033,000)
Other income (expense), net (296,000) (1,130,000) (2,222,000) (2,095,000)
Net loss (3,700,000) (11,181,000) (11,343,000) (23,168,000)
Net change in unrealized gain on available-for-sale securities, net of reclassification adjustments and taxes 3,000 1,000 7,000 7,000
Total comprehensive loss $ (3,697,000) $ (11,180,000) $ (11,336,000) $ (23,161,000)
Net loss per share        
Net income per share, basic $ (0.12) $ (0.46) $ (0.37) $ (0.96)
Net income per share, diluted $ (0.12) $ (0.46) $ (0.37) $ (0.96)
Weighted-average shares used in computing net loss per share        
Weighted-average shares used in computing net loss per share, basic 31,038 24,508 30,838 24,140
Weighted-average shares used in computing net loss per share, diluted 31,038 24,508 30,838 24,377
Collaborative Research and Development and Other Revenue [Member]        
Total revenues $ 606,000 $ 508,000 $ 1,102,000 $ 1,151,000
Product Revenue, Net [Member]        
Total revenues $ 1,565,000 $ 1,573,000 $ 2,896,000 $ 2,984,000