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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Summary of Rental Expense Under Operating Leases
Rent expense related to our operating leases for the years ended December 31, 2018, 2017 and 2016, was as follows (in thousands):
 
For the Years Ended December 31,
 
2018
 
2017
 
2016
Rent expense
$
2,829

 
$
2,614

 
$
2,124

Less: income from subleases
(347
)
 
(418
)
 
(187
)
Net rent expense
$
2,482

 
$
2,196

 
$
1,937

Schedule of Future Lease Obligations Under Operating Leases
Future lease obligations under our operating leases as of December 31, 2018, were as follows (in thousands):
Year
 
 
2019
 
$
2,011

2020
 
1,553

2021
 
688

2022
 
498

2023
 
126

Thereafter
 
15

Total lease commitments
 
4,891

Less: income from subleases
 

Net lease commitments
 
$
4,891