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Commitments and Contingencies (Tables)
9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments under non-cancelable operating leases
Future minimum lease payments under non-cancelable operating leases as of September 30, 2017 are as follows (in thousands of dollars):
 
Year Ending December 31,
 
Remainder of 2017
$
539

2018
2,121

2019
2,227

2020
2,332

2021
2,401

Thereafter
11,856

Total minimum lease payments
$
21,476