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Consolidated Statements of Operations and Comprehensive Income / (Loss) (Parentheticals) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Foreign currency translation adjustments, tax $ 0 $ 0 $ 0
Other comprehensive income (loss), tax $ 0 $ 0 $ 0