Annual report pursuant to Section 13 and 15(d)

Leases - Additional Information (Details)

v3.20.4
Leases - Additional Information (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Lease
Dec. 31, 2019
USD ($)
Jan. 01, 2019
USD ($)
Operating Leased Assets [Line Items]      
Right-of-use asset $ 5,261 $ 7,144  
Lease liability $ 5,745 7,328  
Office Space and Commercial Property      
Operating Leased Assets [Line Items]      
Lessee, operating lease, description These leases have terms which range from one to 18 years, and generally include one or more options to terminate or renew.    
Lessee, operating lease, option to terminate The termination option can reduce the lease term for a period of 10 years    
Lessee, operating lease, terminate term 10 years    
Lessee, operating lease, option to extend The renewal terms can extend the lease term for additional periods ranging from three to five years.    
Operating lease cost for right - of - use assets $ 991 $ 1,015  
Commercial Unit      
Operating Leased Assets [Line Items]      
Lessee, operating sublease, option to extend In September 2020, the Company entered into a sub-lease agreement for a commercial unit that extends through September 2023.    
Sublease Income $ 118    
Minimum | Office Space and Commercial Property      
Operating Leased Assets [Line Items]      
Lessee, operating lease, term of contract 1 year    
Lessee, operating lease, renewal term 3 years    
Maximum | Office Space and Commercial Property      
Operating Leased Assets [Line Items]      
Lessee, operating lease, term of contract 18 years    
Lessee, operating lease, renewal term 5 years    
ASU 2016-02      
Operating Leased Assets [Line Items]      
Right-of-use asset     $ 7,600
Lease liability     $ 7,800
Termination Notice | Office Space and Commercial Property      
Operating Leased Assets [Line Items]      
Number of lease | Lease 1    
Termination Notice | Minimum | Office Space and Commercial Property      
Operating Leased Assets [Line Items]      
Lessee operating leases, expiration period 1 year    
Termination Notice | Maximum | Office Space and Commercial Property      
Operating Leased Assets [Line Items]      
Lessee operating leases, expiration period 6 years