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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases
A summary of future minimum rental payments required under operating leases that have initial or remaining terms in excess of one year as of June 30, 2018 are as follows (in thousands):  
Years ended
 
Operating Leases
2018
 
$
448

2019
 
906

2020
 
829

2021
 
476

2022 and thereafter
 
130

Total minimum lease payments
 
$
2,789