Quarterly report pursuant to Section 13 or 15(d)

Borrowings - 2018 Term Loan (Details)

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Borrowings - 2018 Term Loan (Details) - USD ($)
9 Months Ended
Sep. 28, 2018
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Debt Instrument [Line Items]        
Non-current restricted cash   $ 3,441,000 $ 3,867,000 $ 4,300,000
Term loan | 2018 Term Loan        
Debt Instrument [Line Items]        
Debt term (in years) 3 years      
Principal amount $ 60,000,000.0      
Non-current restricted cash   3,400,000    
Minimum aggregate principal payment   5,000,000.0    
Borrowings principal repayment (Note 9)   1,000,000.0    
Fair value of term loan   $ 58,400,000