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Leases - Operating Leases (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
ft²
Jan. 31, 2020
USD ($)
Oct. 01, 2016
USD ($)
ft²
Hurley Street Lease        
Leases        
Leased space ( in square feet) | ft²       59,783
Security deposit | $       $ 1.6
Lessee, Operating Lease, Existence of Option to Extend true      
Extended lease option (in years)       5 years
One Main Street        
Leases        
Leased space ( in square feet) | ft²   31,571    
Security deposit | $     $ 0.8  
Lessee, Operating Lease, Existence of Option to Extend   true    
Extended lease option (in years)   5 years