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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments And Contingencies Disclosure [Abstract]  
Future Minimum Contractual Commitments under Non-cancelable Agreements

Future minimum contractual commitments as of December 31, 2016 under non-cancelable agreements having remaining terms in excess of one year are as follows: 

 

 

 

2017

 

 

2018

 

 

2019

 

 

2020

 

 

2021

 

 

Thereafter

 

Gas contract

 

$

1,643

 

 

$

1,643

 

 

$

1,643

 

 

$

1,647

 

 

$

680

 

 

$

 

Office leases

 

 

738

 

 

 

661

 

 

 

627

 

 

 

 

 

 

 

 

 

 

Total

 

$

2,381

 

 

$

2,304

 

 

$

2,270

 

 

$

1,647

 

 

$

680

 

 

$