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Fair Value Measurements - Measured on Recurring Basis (Details) - Recurring Basis - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair value measurement of assets and liabilities    
Derivative liabilities $ 1,250 $ 6,337
Derivative Liability, Fair Value by Fair Value Hierarchy Level us-gaap:FairValueInputsLevel2Member us-gaap:FairValueInputsLevel2Member