Annual report pursuant to Section 13 and 15(d)

BORROWINGS - 2018 Term Loan (Details)

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BORROWINGS - 2018 Term Loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 28, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Non-current restricted cash   $ 3,440 $ 3,867 $ 49,875
2018 Term Loan, due September 2021 | Loans Payable        
Debt Instrument [Line Items]        
Debt term (in years) 3 years      
Principal amount $ 60,000      
Non-current restricted cash   $ 3,400    
Period following closing date to mark voluntary principal repayments   6 months    
Minimum aggregate principal payment   $ 5,000    
Borrowings principal repayment   $ 1,000