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Leases (Tables)
 3 Months Ended
Mar. 31, 2022
Leases [Abstract]  
Components of Lease Expense
The following table sets forth the components of lease expense for the three months ended March 31, 2022 and 2021 (in thousands):

Three Months Ended March 31,
20222021
Operating lease cost$1,634 $1,630 
Short-term lease cost88 41 
Variable lease cost973 25 
Total$2,695 $1,696 
Supplemental Balance Sheet Information
Supplemental balance sheet information related to operating leases as of March 31, 2022 and December 31, 2021 was as follows (in thousands, except for lease term and discount rate):

As of
March 31, 2022December 31, 2021
Operating right-of-use assets$27,556$27,897
Operating lease liabilities, current$8,135$8,110
Operating lease liabilities, net of current portion47,96448,784
Total operating lease liabilities$56,099$56,894
Weighted average remaining lease term (in years)9.39.5
Weighted average discount rate9.5 %9.5 %
Supplemental Cash Flow Information
Supplemental cash flow and expense information related to operating leases for the three months ended March 31, 2022 and 2021 was as follows (in thousands):

Three Months Ended March 31,
20222021
Operating cash outflows for operating leases$2,085 $1,749 
Amortization of operating ROU assets306 324 
Interest expense on operating lease liabilities1,321 402 
Maturities of Operating Lease Liabilities
A summary of our future minimum lease commitments under non-cancellable leases as of March 31, 2022 is as follows (in thousands):

Operating Leases
2022 (excluding the three months ended March 31, 2022)
$6,361 
20238,303 
20248,619 
20259,316 
20269,363 
Thereafter48,775 
Total lease payments90,737 
Less: imputed interest(34,638)
Total$56,099