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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Operating expenses:          
Research and development $ 4,841 $ 8,852 $ 73,634 $ 31,065 $ 16,839
General and administrative 2,539 2,839 11,823 8,640 2,043
Total operating expenses 7,380 11,691 85,457 39,705 18,882
Loss from operations (7,380) (11,691) (85,457) (39,705) (18,882)
Interest income     2,817 2,124  
Other expense, net 349 631 (63) (7) (14,896)
Loss before income taxes (7,031) (11,060) (82,703) (37,588) (33,778)
Income tax expense 7 9 36 26  
Net loss $ (7,038) $ (11,069) $ (82,739) $ (37,614) $ (33,778)
Net loss per share, basic and diluted $ (0.19) $ (0.38) $ (2.41) $ (1.42) $ (8.42)
Weighted-average common shares used in computing net loss per share, basic and diluted 36,445,169 29,014,750 34,306,374 26,439,216 4,009,513
Other comprehensive gain (loss):          
Net loss $ (7,038) $ (11,069) $ (82,739) $ (37,614) $ (33,778)
Net unrealized (losses) gains on marketable securities (17) 73 90 (41)  
Total other comprehensive income (loss)     90 (41)  
Comprehensive loss $ (7,055) $ (10,996) $ (82,649) $ (37,655) $ (33,778)