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Consolidated Statements of Comprehensive Loss (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Unrealized loss on marketable securities, tax $ 0 $ 0 $ 165
Foreign currency translation gain, tax $ 0 $ 0 $ 0