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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments on Non-Cancelable Operating Leases

Future minimum lease payments on non-cancelable operating leases as of December 31, 2017 are as follows:

 

Years ending December 31,      
2018   $ 110  
2019     109  
    $ 219