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DEBT - Outstanding borrowing arrangements, excluding PPP and other governmental loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2019
Debt Instrument [Line Items]      
Total outstanding principal balance $ 152,782 $ 187,156  
Less: Unamortized debt issuance costs and discounts (18,386) (13,923)  
Total debt 134,396 173,233  
Less : Current portion of long term debt (7,514) (11,063)  
Long term debt, net of current portion 126,882 162,170  
TCW Credit Agreement      
Debt Instrument [Line Items]      
Total outstanding principal balance 106,250 150,000  
Cumulative PIK interest for TCW Credit Agreement      
Debt Instrument [Line Items]      
Total outstanding principal balance 46,518 36,858  
GDS Obligation      
Debt Instrument [Line Items]      
Total outstanding principal balance 0 298 $ 1,419
Others      
Debt Instrument [Line Items]      
Total outstanding principal balance $ 14 $ 0