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Leases (Tables)
3 Months Ended
Mar. 31, 2019
Leases [Abstract]  
Operating Lease Costs The operating lease costs were as follows:
 
Three Months Ended March 31,
(in thousands)
2019
Operating lease cost
$
1,343

Variable lease cost (1)
290

Total operating lease costs
$
1,633


(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 March 31, 2019, maturities of the Company’s operating lease liabilities are as follows:
Year Ending December 31,
(in thousands)
2019 remaining nine months
$
4,888

2020
6,735

2021
6,942

2022
5,464

2023
5,557

2024 and thereafter
17,959

Total operating lease payments
47,545

Less imputed interest (1)
(16,019
)
Present value of operating lease payments
$
31,526

 
(1) The Company’s 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.

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:
 
Three Months Ended March 31,
(in thousands)
2019
Cash paid for amounts included in the measurement of operating lease liabilities
$
1,450

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