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Commitments and Contingencies - Schedule of Aggregate Minimum Annual Lease Payments under Operating Lease (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2017 $ 652
2018 568
2019 497
2020 358
2021 and thereafter 1,075
Total annual lease payments $ 3,150