Quarterly report pursuant to Section 13 or 15(d)

Long-term Borrowings (Details)

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Long-term Borrowings (Details) - USD ($)
3 Months Ended
Sep. 28, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Debt Instrument [Line Items]        
Outstanding principal amount   $ 57,316,000 $ 57,048,000  
Non-current restricted cash   28,040,000 $ 49,875,000 $ 0
Minimum aggregate principal payment   5,000,000    
Integral multiple payments in excess thereof   $ 1,000,000    
Early termination premium (as a percentage)   1.00%    
LIBOR        
Debt Instrument [Line Items]        
Basis on variable rate, first year (as a percentage)   5.00%    
Basis on variable rate, second year (as a percentage)   7.00%    
Basis on variable rate, thereafter (as a percentage)   8.00%    
Term Loan        
Debt Instrument [Line Items]        
Debt term (in years) 3 years      
Principal amount $ 60,000,000.0      
Principal amount as a percentage of par amount 99.00%      
Discount $ 600,000      
Fees $ 2,600,000      
Outstanding principal amount   $ 60,000,000    
Unamortized discount and deferred financing costs   2,700,000    
Non-current restricted cash   27,800,000    
Interest expense   $ 1,200,000