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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 158,716 | $ 198,753
United States and Canada |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 71,564 | 112,424
South Africa |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | 63,693 | 60,580
Other |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets by Geographic Concentration, Total | $ 23,459 | $ 25,749

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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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