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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 161,373 | $ 162,256
United States and Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 81,769 | 79,809
South Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 53,610 | 56,937
Other |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 25,994 | $ 25,510

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