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Leases Leases (Tables)
12 Months Ended
Dec. 31, 2019
Leases [Abstract]  
Operating Lease Costs
The operating lease costs are summarized as follows:
 
Year Ended
(in thousands)
December 31, 2019
Operating lease cost
$
5,618

Variable lease cost (1)
1,184

Total operating lease costs
$
6,802

(1)
Variable lease cost includes management fees, common area maintenance, property taxes, and insurance, which are not included in the lease liabilities and are expensed as incurred.
Operating Lease Liability Maturities
As of December 31, 2019, maturities of our operating lease liabilities are as follows:
Year Ending December 31,
(in thousands)
2020
$
6,735

2021
6,942

2022
5,464

2023
5,557

2024
5,733

2025 and thereafter
12,226

Total operating lease payments
42,657

Less imputed interest (1)
(13,317
)
Present value of operating lease payments
$
29,340

(1)
Our lease contracts do not provide a readily determinable implicit rate. The imputed interest was based on a weighted average discount rate of 12.0%, which represents the estimated incremental borrowing based on the information available at the adoption or commencement dates.
Schedule of Future Minimum Rental Payments for Operating Leases under ASC 840
As of December 31, 2018, the aggregate total future minimum lease payments under non-cancelable operating leases were as follows:
Year Ending December 31,
(in thousands)
2019
$
5,826

2020
6,011

2021
6,196

2022
4,696

2023 and thereafter
20,173

Total payments
$
42,902


Supplemental Cash Flow Information
Supplemental cash flow information related to the operating leases was as follows:
 
Year Ended
(in thousands)
December 31, 2019
Cash paid for amounts included in the measurement of operating lease liabilities
$
6,339

Right-of-use assets obtained in exchange for operating lease liabilities
$
3,890