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Commitments (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments
As of June 30, 2017, the aggregate future minimum lease payments under our leases are as follows (in thousands): 
 
Capital leases
 
Other financing obligations (1)
Remainder of 2017
$
1,990

 
$
—

Year Ending December 31,
 
 
 
2018
2,802

 
566

2019
605

 
1,477

2020
630

 
1,685

2021
637

 
1,745

2022
646

 
1,814

Thereafter
3,465

 
10,441

 
$
10,775

 
$
17,728

____________________
(1)
Other financing obligations includes payments related to build-to-suit lease arrangements.
Schedule of Rent Expense
Rent expense and sublease income were as follows for the periods presented (in thousands):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Gross rental expense
$
1,493

 
$
3,194

 
$
3,771

 
$
5,453

less: Sublease income
(306
)
 
(895
)
 
(1,225
)
 
(1,730
)
Net rental expense
$
1,187

 
$
2,299

 
$
2,546

 
$
3,723