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Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating expenses:      
Research and development $ 73,634 $ 31,065 $ 16,839
General and administrative 11,823 8,640 2,043
Total operating expenses 85,457 39,705 18,882
Loss from operations (85,457) (39,705) (18,882)
Interest income 2,817 2,124  
Other expense, net (63) (7) (14,896)
Loss before income taxes (82,703) (37,588) (33,778)
Income tax expense 36 26 0
Net loss $ (82,739) $ (37,614) $ (33,778)
Net loss per share, basic and diluted $ (2.41) $ (1.42) $ (8.42)
Weighted-average common shares used in computing net loss per share, basic and diluted 34,306,374 26,439,216 4,009,513
Other comprehensive loss:      
Net unrealized gains (losses) on marketable securities $ 90 $ (41)  
Total other comprehensive income (loss) 90 (41)  
Comprehensive loss $ (82,649) $ (37,655) $ (33,778)