Leases (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Leases [Abstract]    
Components of Lease Cost
The following table provides the components of lease cost recognized in the condensed consolidated statement of operations and comprehensive income for the three and nine months ended September 30, 2021 and 2020:
 
    
For the Three Months
Ended September 30,
    
For the Nine Months
Ended September 30,
 
Lease Cost
  
2021
    
2020
    
2021
    
2020
 
                             
    
(dollars in thousands)
 
Operating lease cost
     2,483        1,545        5,751        4,087  
Finance lease cost:
                                   
Amortization of lease assets
     1,990        1,496        5,357        3,688  
Interest on lease liabilities
     1,177        782        2,914        1,801  
    
 
 
    
 
 
    
 
 
    
 
 
 
Finance lease cost
     3,167        2,278        8,271        5,489  
Variable lease cost
     2,529        28        3,139        310  
    
 
 
    
 
 
    
 
 
    
 
 
 
Total lease cost
   $ 8,179      $ 3,851      $ 17,161      $ 9,886  
    
 
 
    
 
 
    
 
 
    
 
 
 
The following table provides the components of lease cost recognized in the consolidated statement of operations and comprehensive income for the year ended December 31, 2020 and 2019.
 
    
Year Ended

December 31,
 
Lease Cost
  
2020
    
2019
 
Operating lease cost
     5,700        5,542  
Finance lease cost:
                 
Amortization of lease assets
     4,956        1,984  
Interest on lease liabilities
     2,133        960  
    
 
 
    
 
 
 
Finance lease cost
     7,089        2,944  
Variable lease cost
     222        192  
    
 
 
    
 
 
 
Total lease cost
   $ 13,010      $ 8,678  
    
 
 
    
 
 
 
Schedule of Weighted Average Discount Rate and Remaining Lease Term
Weighted average discount rate and remaining lease term for the nine months ended September 30, 2021 are as follows:
 
    
Operating
lease
   
Finance
lease
 
Weighted average discount rate
     8.75     8.46
Weighted average remaining lease term (in years)
     8.67       8.20  
Other information related to operating and finance leases as of and for the year ended December 31, 2020 are as follows:
 
    
Finance

Lease
   
Operating

Lease
 
Weighted average discount rate
     8.36     8.64
Weighted average remaining lease term (in years)
     8.51       7.49  
Schedule of Maturity of Contractual Undiscounted Lease Liabilities
The maturity of the contractual undiscounted lease liabilities as of September 30, 2021 is as follows:
 
    
Operating
leases
    
Finance
leases
 
               
    
(dollars in thousands)
 
Remainder of 2021
   $ 1,991      $ 2,494  
2022
     8,173        10,509  
2023
     7,886        13,246  
2024
     7,759        9,395  
2025
     7,800        9,069  
Thereafter
     35,893        43,875  
    
 
 
    
 
 
 
Total undiscounted lease liabilities
     69,502        88,588  
Interest on lease liabilities
     (21,581      (26,000
    
 
 
    
 
 
 
Total present value of minimum lease payments
     47,921        62,588  
Lease liability—current portion
     (4,264      (5,354
    
 
 
    
 
 
 
Lease liability
   $ 43,657      $ 57,234  
    
 
 
    
 
 
 
The maturity of the contractual undiscounted lease liabilities as of December 31, 2020 is as follows:
 
Year Ended December 31,
  
Finance

Lease
    
Operating

Lease
 
               
    
(dollars in thousands)
 
2021
   $ 6,964      $ 5,480  
2022
     6,642        5,405  
2023
     6,257        5,276  
2024
     5,787        4,921  
2025
     5,588        4,843  
Thereafter
     24,669        14,225  
    
 
 
    
 
 
 
Total undiscounted lease liabilities
     55,907        40,150  
Interest on lease liabilities
     (16,972      (10,545
    
 
 
    
 
 
 
Total present value of minimum lease payments
     38,935        29,605  
Lease liability—current portion
     3,877        3,154  
    
 
 
    
 
 
 
Lease liability
   $ 35,058      $ 26,450