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Statements of Stockholders' Equity (Deficit) - 12 months ended Dec. 31, 2019 - USD ($)
$ in Thousands
Total
IPO
Follow-on Offering
Preferred Stock
Series A Preferred Stock
Common Stock
Common Stock
IPO
Common Stock
Follow-on Offering
Additional Paid In Capital
Additional Paid In Capital
IPO
Additional Paid In Capital
Follow-on Offering
Accumulated Other Comprehensive Gain
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018       0 27,274,991              
Beginning balance at Dec. 31, 2018 $ 84,384     $ 0 $ 1     $ 207,408     $ 0 $ (123,025)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                        
Issuance of common stock (in shares)           5,999,550 288,124          
Issuance of common stock   $ 73,022 $ 2,455           $ 73,022 $ 2,455    
Stock-based compensation 9,624             9,624        
Net loss (90,034)                     (90,034)
Other comprehensive gain 6                   6  
Ending balance (in shares) at Dec. 31, 2019       0 33,562,665              
Ending balance at Dec. 31, 2019 $ 79,457     $ 0 $ 1     $ 292,509     $ 6 $ (213,059)