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Consolidated Statements of Comprehensive Loss-Unaudited - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Revenues:    
Royalties and other revenue $ 24 $ 37
Stock-based compensation expense associated with research and development expense 1,203 1,032
Operating expenses:    
Research and development, including stock-based compensation of $1,203 and $1,032, respectively 12,026 14,926
Selling, general and administrative, including stock-based compensation of $2,212 and $1,740, respectively 19,140 8,491
Total operating expenses (31,166) 23,417
Loss from operations (31,142) (23,380)
Interest expense (1,821) (110)
Interest and other income, net 1,029 14
Net loss $ (31,934) $ (23,476)
Net income (loss) per common share, Basic $ (0.17) $ (0.16)
Shares used in computing net loss per common share, Basic 189,014 149,150
Unrealized gain on investments   $ (27)
Unrealized gain on investments $ 265 (27)
Comprehensive loss $ (31,669) $ (23,503)