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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Restricted Cash        
Cash and cash equivalents $ 43,113 $ 114,573    
Restricted cash - current 5,643 5,643    
Restricted cash - noncurrent 315 315    
Cash, cash equivalents and restricted cash $ 49,071 $ 120,531 $ 164,025 $ 179,679