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Lease (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
item
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Nov. 15, 2018
Leases        
Restricted cash $ 12,584 $ 12,575 $ 12,582  
Variable lease cost $ 410 124    
Remaining lease term 1 year 10 months 24 days      
Number of vehicles leased under a master fleet lease agreement | item 65      
Term of vehicle lease 3 years      
Amount borrowed $ 500      
Lease cost        
Operating lease cost 1,185 1,102    
Variable Lease, Cost 410 124    
Total lease cost 1,595 1,226    
Operating cash outflows from operating leases 1,444 743    
Operating Lease, Right-of-Use Asset $ 29,308   $ 29,781  
Watertown Lease        
Leases        
Lease term 13 years      
Restricted cash $ 2,000      
Discount rate (as a percent)       9.90%
Variable lease cost $ 400 100    
Remaining lease term 11 years 7 months 6 days      
Lease cost        
Variable Lease, Cost $ 400 $ 100