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Schedule of Future Minimum Annual Lease Payments under All Non-cancelable Operating Leases (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Remaining in 2018 $ 122
2019 563
2020 580
2021 598
2022 616
2023 209
Total future minimum lease payments $ 2,688