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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2018
Commitments and Contingencies [Abstract]  
Remaining Aggregate Annual Commitments
As of March 31, 2018, the remaining aggregate annual commitments pursuant to the leases, as amended, are as follows:

2018 (remaining nine months)
 
$
641
 
2019
  
874
 
2020
  
897
 
2021
  
718
 
2022
  
445
 
Thereafter
  
74
 
Total
 
$
3,649