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Leases (Tables)
9 Months Ended
Sep. 30, 2021
Leases [Abstract]  
Schedule of Undiscounted Future Lease Payments under Operating Lease As of September 30, 2021, the undiscounted future non-cancellable lease payments under the lease agreements, after giving effect to the amendment to terminate one of its premises under the Existing lease and the sublease of the NC Premises, are as follows (in thousands):
Year ending December 31,Operating LeasesSublease Payments Receivable
2021 (remaining 3 months)$818 $463 
20226,049 491 
202313,947 5,844 
202414,405 6,019 
202514,880 6,200 
Thereafter149,252 89,136 
Total undiscounted lease payments199,351 $108,153 
Less: Present value adjustment(75,629)
Less: Tenant improvement allowance(30,015)
Add: Lease incentive receivable7,358 
Total lease liability as of September 30, 2021$101,065