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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Obligations Under Non-cancelable Operating Leases
As of December 31, 2017, obligations under non-cancelable operating leases are as follows (dollar amounts in thousands):
Year Ending December 31,
 
2018
$
348

2019
353

2020
298

2021
217

2022
217

Thereafter
217

  Total
$
1,650