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Segment and Geographical Information - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) Location | Dec. 31, 2014 USD ($) Location | Dec. 31, 2013 USD ($) Location
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of reportable business segment | Location |  |  |  |  |  |  |  |  | 1 |  |
Number of geographic regions | Location |  |  |  |  |  |  |  |  | 2 | 2 | 2
Revenues | $ | $ 47,003 | $ 42,996 | $ 46,633 | $ 48,647 | $ 53,627 | $ 51,013 | $ 53,167 | $ 49,173 | $ 185,279 | $ 206,980 | $ 204,724
Minimum percentage of revenues |  |  |  |  |  |  |  |  | 10.00% |  |
Japan [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ |  |  |  |  |  |  |  |  | $ 33,000 | $ 31,900 | $ 28,000
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Japan [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of revenues |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | Non-US, excluding Japan [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Minimum percentage of revenues |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00%

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