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VIE Structure and Arrangements (Details)
$ in Thousands, ¥ in Millions
12 Months Ended
Dec. 19, 2019
USD ($)
Dec. 31, 2020
USD ($)
entity
Dec. 31, 2019
USD ($)
Apr. 05, 2016
CNY (¥)
VIE Structure and Arrangements        
Total income tax expense (benefit)   $ 0 $ 417  
Number of variable interest entity | entity   2    
Gain (loss) on extinguishment of debt $ 2,700 $ 8,891 (3,940)  
VIE        
VIE Structure and Arrangements        
Net loss     2,000  
Total income tax expense (benefit)     200  
Loan Agreement        
VIE Structure and Arrangements        
Gain (loss) on extinguishment of debt     $ 5,100  
Loan Agreement | Subsidiaries        
VIE Structure and Arrangements        
Loan payable | ¥       ¥ 19.8
Loan Agreement | Nominee Shareholders        
VIE Structure and Arrangements        
Loan payable | ¥       ¥ 0.2