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Future Minimum Lease payments for Long-term Non-cancelable Lease agreements (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Operating Leased Assets [Line Items]  
2017 $ 115
2018 83
2020 28
2021 0
2022 0
Thereafter 0
Operating Leases, Future Minimum Payments Due, Total $ 226