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Additional Information-Financial Statement Schedule I Condensed Financial Information of Parent Company - STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Income Statements, Captions [Line Items]      
Selling and marketing $ 2,588 $ 14,364 $ 24,077
Research and development 757 3,357 4,419
General and administrative 6,832 36,145 23,012
Total operating expenses 7,256 127,957 51,508
Net loss (5,303) (46,116) (89,215)
Other comprehensive income (loss), net of tax:      
Foreign currency translation 408 (4,549) 404
Comprehensive loss (4,912) (73,617) (89,128)
Parent      
Condensed Income Statements, Captions [Line Items]      
Selling and marketing     54
Research and development     204
General and administrative 0 109 5,394
Reportable legal entities | Parent      
Condensed Income Statements, Captions [Line Items]      
Selling and marketing     (1,504)
Research and development     (107)
General and administrative (3,745) (371) (11,505)
Total operating expenses (3,745) (371) (13,116)
Equity in loss of subsidiaries and variable interest entities (899) (45,745) (76,099)
Net loss (4,644) (46,116) (89,215)
Other comprehensive income (loss), net of tax:      
Foreign currency translation (68) (4,222) 404
Other comprehensive income (loss) (68) (4,222) 404
Comprehensive loss $ (4,712) $ (50,338) $ (88,811)