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Commitments and Contingencies - Schedule of Contractual Obligations and Commitments Comprising of Future Minimum Lease Payments (Detail) - Stamford Operating Lease [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Operating Leased Assets [Line Items]  
2018 $ 1,091
2019 1,215
2020 1,240
2021 1,264
2022 1,288
Thereafter 1,164
Total $ 7,262