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Additional Information-Financial Statement Schedule I Condensed Financial Information of Parent Company - STATEMENTS OF CASH FLOWS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Cash flows from operating activities:          
Net loss $ (5,320) $ (69,068) $ (89,532)    
Share-based compensation 3,362 3,813 11,436    
Changes in operating assets and liabilities:          
Accrued expenses and other payables 504 5,380 395    
Prepaid expenses and other current assets 19 (12,527) (22,967)    
Net cash used in operating activities (3,878) (4,745) (9,749)    
Cash flows from investing activities:          
Net cash provided by investing activities   1,223 98,982    
Cash flows from financing activities:          
Proceeds from borrowings 1,015 18,166 71,640    
Repayment of borrowings (3,238) (51,214) (107,500)    
Proceeds of advances from related parties 2,140 115,035 159,938    
Repayment of advances from related parties   (116,821) (143,447)    
Proceeds from convertible loans   21,000      
Proceeds from investors 1,000   57,767    
Net cash (used in) provided by financing activities 3,917 (6,328) (138,637)    
Cash and restricted cash at beginning of year 3,190 13,768 64,447    
Effect of exchange rate changes (67) (728) (1,275)    
Cash and restricted cash at end of year 3,162 3,190 13,768    
Reportable legal entities | Parent          
Cash flows from operating activities:          
Net loss (5,302) (46,116) (89,215)    
Equity in loss of subsidiaries and variable interest entities 899 45,745 76,099    
Share-based compensation 3,362   11,436    
Changes in operating assets and liabilities:          
Amounts due from/to related parties   (20,980) 173    
Accrued expenses and other payables 2,347 (292) 581    
Prepaid expenses and other current assets   123      
Net cash used in operating activities 1,306 (21,520) (926)    
Cash flows from investing activities:          
Repayment of investment in subsidiaries (2,340) 1,586      
Net cash provided by investing activities (2,340) 1,586      
Cash flows from financing activities:          
Proceeds from borrowings     500    
Repayment of borrowings     (500)    
Proceeds of advances from related parties     950    
Repayment of advances from related parties   (1,050)      
Proceeds from convertible loans   21,000      
Proceeds from warrant liability 3,000        
Proceeds from investors 1,000        
Net cash (used in) provided by financing activities 4,000 19,950 950    
Net increase in cash     2,965 $ 16 $ 24
Cash and restricted cash at beginning of year 40 24      
Effect of exchange rate changes 0 0 0    
Cash and restricted cash at end of year $ 3,005 $ 40 $ 24