Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Long-term Borrowings (Details)

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Borrowings - Long-term Borrowings (Details) - USD ($)
9 Months Ended
Sep. 28, 2018
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Debt Instrument [Line Items]        
Non-current restricted cash   $ 4,300,000 $ 49,875,000 $ 57,440,000
Term loan        
Debt Instrument [Line Items]        
Minimum aggregate principal payment   5,000,000    
Integral multiple payments in excess thereof   1,000,000    
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   $ 4,300,000