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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 162,256 | $ 158,207
United States and Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 79,809 | 65,208
South Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 56,937 | 68,186
Other |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 25,510 | $ 24,813

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