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Commitments (Tables)
12 Months Ended
Dec. 29, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Aggregate Future Minimum Lease Payments Under Operating Leases
As of December 31, 2017, the aggregate future minimum lease payments under our leases were as follows (in thousands): 
 
 
Operating leases
 
Other financing obligations (1)
Year ending December 31,
 
 
 
 
2018
 
$
2,864

 
$
800

2019
 
664

 
1,905

2020
 
684

 
2,129

2021
 
694

 
2,213

2022
 
704

 
2,282

Thereafter
 
3,730

 
12,164

 
 
$
9,340

 
$
21,493

____________________
(1)
Other financing obligations includes payments related to our build-to-suit lease.
Schedule of Rent Expense
Rent expense and sublease income were as follows (in thousands):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Gross rental expense
$
6,160

 
$
9,676

 
$
13,942

less: Sublease income
(1,225
)
 
(3,553
)
 
(5,205
)
Net rental expense
$
4,935

 
$
6,123

 
$
8,737