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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 198,753 | $ 95,020
United States and Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 112,424 | 92,430
South Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 60,580 | 0
Europe, Latin America and Asia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 22,749 | 2,590
Australia |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 3,000 | $ 0

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