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Financing Arrangements (Details) - USD ($)
$ in Thousands
1 Months Ended
Jan. 30, 2015
Dec. 31, 2020
Jul. 31, 2020
Dec. 31, 2019
Financing Arrangements        
Finance lease obligations   $ 48,149    
Long-term finance lease obligation   47,393   $ 48,149
Sale leaseback obligation        
Financing Arrangements        
Finance lease obligations   48,100    
Security deposit   5,900    
Sale leaseback obligation current   800    
Beverly Property Owner LLC | Buildings        
Financing Arrangements        
Sale price $ 48,900      
Lease term 22 years      
Silicon Valley Bank | Revolving credit facility        
Financing Arrangements        
Maximum borrowing capacity under the credit facility     $ 40,000  
Borrowings amount   0    
Silicon Valley Bank | Revolving credit facility | Letter of credit        
Financing Arrangements        
Letter of credit   $ 5,900