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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2018 are as follows (in thousands):  
Years ended
 
Operating Leases
2018
 
$
669

2019
 
905

2020
 
827

2021
 
474

2022 and thereafter
 
129

Total minimum lease payments
 
$
3,004