Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Long-term Borrowings (Details)

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BORROWINGS - Long-term Borrowings (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Non-current restricted cash   $ 3,867 $ 49,875 $ 0
2018 Term Loan        
Debt Instrument [Line Items]        
Debt term (in years) 3 years      
Principal amount $ 60,000      
Non-current restricted cash   3,900    
Voluntary principal payment, minimum amount   5,000    
Voluntary principal payment, integral multiples in excess thereof   $ 1,000