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Consolidated Statement of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Issuance cost of common stock $ 1,148 $ 3,874  
Series E Preferred Stock [Member]      
Issuance cost of convertible preferred Stock     $ 214