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Leases
 3 Months Ended
Mar. 31, 2019
Leases [Abstract]  
Commitments and Contingencies
The Company leases office space and equipment under various operating and finance leases, which generally are expected to be renewed or replaced by other leases.  As of March 31, 2019, the components of lease cost were as follows:  
Components of Lease Cost
Three Months Ended
March 31,
(in thousands)2019
Finance lease cost:
Amortization of right-of-use assets$31 
Interest on lease liabilities2 
Operating lease cost1,024 
Short-term lease cost52 
Variable lease cost105 
Total lease cost$1,214 
Rent expense for March 31, 2018 was immaterial.

Maturities of lease liabilities were as follows:
Future Minimum Lease Payments
March 31, 2019December 31, 2018
(in thousands)Operating LeasesFinance LeasesOperating LeasesCapital Leases
2019$3,494 $144 $3,310 $125 
20202,408 101 2,453 97 
20211,221 74 1,308 62 
2022758 31 743 24 
2023361 17 419 1 
Thereafter29 26 79 — 
Total minimum lease payments$8,271 $393 $8,312 $309 
Less imputed interest(385)(25)— (11)
Total lease liabilities$7,886 $368 $8,312 $298 
As of March 31, 2019, we have an additional operating lease, primarily for a building that has not yet commenced of $627,000. This operating lease will commence in fiscal year 2019 with a lease term of 5 years.
Commitments and Contingencies
The Company leases office space and equipment under various operating and finance leases, which generally are expected to be renewed or replaced by other leases.  As of March 31, 2019, the components of lease cost were as follows:  
Components of Lease Cost
Three Months Ended
March 31,
(in thousands)2019
Finance lease cost:
Amortization of right-of-use assets$31 
Interest on lease liabilities2 
Operating lease cost1,024 
Short-term lease cost52 
Variable lease cost105 
Total lease cost$1,214 
Rent expense for March 31, 2018 was immaterial.

Maturities of lease liabilities were as follows:
Future Minimum Lease Payments
March 31, 2019December 31, 2018
(in thousands)Operating LeasesFinance LeasesOperating LeasesCapital Leases
2019$3,494 $144 $3,310 $125 
20202,408 101 2,453 97 
20211,221 74 1,308 62 
2022758 31 743 24 
2023361 17 419 1 
Thereafter29 26 79 — 
Total minimum lease payments$8,271 $393 $8,312 $309 
Less imputed interest(385)(25)— (11)
Total lease liabilities$7,886 $368 $8,312 $298 
As of March 31, 2019, we have an additional operating lease, primarily for a building that has not yet commenced of $627,000. This operating lease will commence in fiscal year 2019 with a lease term of 5 years.