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Fair Value Measurement (Details) - Schedule of fair value measurements of group’s assets and liabilities of recurring basis - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Fair Value Measurement (Details) - Schedule of fair value measurements of group’s assets and liabilities of recurring basis [Line Items]    
Cash and cash equivalents $ 13,367 $ 21,496
Restricted cash 20,460 19,700
Convertible notes 64,343  
Total 98,170 41,196
Quoted Prices in Active Market for Identical Assets (Level 1) [Member]    
Fair Value Measurement (Details) - Schedule of fair value measurements of group’s assets and liabilities of recurring basis [Line Items]    
Cash and cash equivalents 13,367 21,496
Restricted cash 20,460 19,700
Convertible notes  
Total 33,827 41,196
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurement (Details) - Schedule of fair value measurements of group’s assets and liabilities of recurring basis [Line Items]    
Cash and cash equivalents
Restricted cash
Convertible notes  
Total
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurement (Details) - Schedule of fair value measurements of group’s assets and liabilities of recurring basis [Line Items]    
Cash and cash equivalents
Restricted cash
Convertible notes 64,343  
Total $ 64,343