Future Minimum Payments Under Non-Cancelable Portion of Operating Leases and Non-Cancelable Purchase Commitments (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Commitments And Contingencies Disclosure [Abstract]
2018	$ 7,743
2019	2,559
2020	2,621
2021	2,549
2022	2,543
Thereafter	6,595
Total	$ 24,610

Operating leases and purchase commitments future minimum payments due.

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Operating leases and purchase commitments future minimum payments due current.

No definition available.

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Operating leases and purchase commitments future minimum payments due in five years.

No definition available.

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Operating leases and purchase commitments future minimum payments due in four years.

No definition available.

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Operating leases and purchase commitments future minimum payments due in three years.

No definition available.

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Operating leases and purchase commitments future minimum payments due in two years.

No definition available.

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Operating leases and purchase commitments future minimum payments due thereafter.

No definition available.

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No definition available.

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