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Schedule of Future Minimum Annual Lease Payments under All Non-cancelable Operating Leases (Detail)
$ in Thousands
Jun. 30, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
Remaining in 2018 $ 179
2019 367
2020 378
2021 389
2022 400
2023 135
Total future minimum lease payments $ 1,848