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Statements of Changes in Convertible Preferred Stock and Stockholders’ Equity (Deficit) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Issuance cost $ 3,495  
Series A-1 Convertible Preferred Stock    
Issuance cost   $ 19