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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611

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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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