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Leases (Tables)
 9 Months Ended
Sep. 30, 2020
Leases [Abstract]  
Summary of Components of Lease Expense and Supplemental Cash Flow Information Related to Leases
The components of lease expense were as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
 (in thousands)
Operating lease cost$3,836 $3,288 $11,088 $8,321 
Short-term lease costs301 323 815 998 
Variable lease costs1,181 894 3,471 2,407 
Total lease costs$5,318 $4,505 $15,374 $11,726 
Supplemental cash flow information related to leases was as follows:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
(in thousands)
Cash paid for amounts included in the measurement of lease liabilities$5,743 $3,006 $12,103 $8,421 
Operating lease ROU assets obtained in exchange for new lease obligations$456 $3,682 $16,053 $64,454 
Summary of Supplemental Balance Sheet Information Related to Operating Leases
Supplemental balance sheet information related to the operating leases was as follows:
As of September 30, 2020As of December 31, 2019
 (in thousands, except lease term and discount rate)
Operating lease right-of-use (ROU) assets$69,797 $60,984 
Operating lease liabilities, current portion$9,568 $7,179 
Operating lease liabilities, non-current portion77,863 72,294 
Total operating lease liabilities$87,431 $79,473 
Weighted average remaining lease term (in years) - operating leases8.08.7
Weighted average discount rate - operating leases7.7 %7.6 %
Summary of Maturities of Operating Lease Liabilities and Future Minimum Payments under Non-cancellable Leases Maturities of operating lease liabilities as of September 30, 2020 were as follows (in thousands):
2020 (for the remaining three months)$2,642 
202116,491 
202213,859 
202314,046 
202413,339 
2025 and thereafter53,933 
Total lease payments$114,310 
Less: imputed interest(26,879)
Total$87,431