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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS    
Foreign currency translation adjustments, tax $ 0 $ 0
Foreign currency gains on intercompany loan of a long-term investment nature, tax 0 0
Unrealized holding losses on available-for-sale debt securities, tax $ 0 $ 0