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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Obligations Under Non-cancelable Operating Leases
As of December 31, 2018, obligations under non-cancelable operating leases are as follows (dollar amounts in thousands):
Year Ending December 31,
 
2019
$
1,240

2020
1,464

2021
1,392

2022
1,394

2023
1,397

Thereafter
6,507

  Total
$
13,394