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Geographic Information and Concentrations of Risk - Schedule of Geographic Concentration of Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	$ 158,207	$ 158,716
United States and Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	65,208	71,564
South Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	68,186	63,693
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets by Geographic Concentration, Total	$ 24,813	$ 23,459

X

- 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

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+ References

No definition available.

+ Details

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