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Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Revenue—related party $ 4,814 $ 7,465 $ 833 $ 9,465
Operating expenses:        
Research and development 10,616 8,676 22,359 15,709
General and administrative 5,025 7,419 10,655 9,943
Total operating expenses 15,641 16,095 33,014 25,652
Loss from operations (10,827) (8,630) (32,181) (16,187)
Interest income 9 229 50 551
Interest expense (51) (34) (101) (34)
Other income (expense), net (62) (20) (66) 50
Loss before income tax expense (benefit) (10,931) (8,455) (32,298) (15,620)
Income tax expense (benefit) (77) 0 (125) (2,679)
Net loss $ (10,854) $ (8,455) $ (32,173) $ (12,941)
Net loss per share attributable to common stockholders, basic and diluted $ (0.34) $ (3.88) $ (1.11) $ (5.96)
Weighted-average common shares used in computing net loss per share attributable to common stockholders, basic and diluted 31,824,405 2,177,157 28,977,993 2,170,298
Other comprehensive income (loss):        
Unrealized (loss) gain on marketable debt securities, net of tax $ (2) $ 189 $ (24) $ 174
Total other comprehensive (loss) income (2) 189 (24) 174
Comprehensive loss $ (10,856) $ (8,266) $ (32,197) $ (12,767)