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Operating Segment and Enterprise Wide Reporting - Schedule of Net Long-lived Tangible Assets by Location (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Revenues From External Customers And Long Lived Assets [Line Items] |  |
Net long-lived tangible assets | $ 23,894 | $ 27,569
United States [Member] |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Net long-lived tangible assets | 22,150 | 24,914
United Kingdom [Member] |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Net long-lived tangible assets | 782 | 1,176
Europe (Excluding United Kingdom) [Member] |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Net long-lived tangible assets | 259 | 381
Other [Member] |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Net long-lived tangible assets | $ 703 | $ 1,098

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