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Intangible Assets - Summary of Amortization Expenses of Purchased Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$ 562us-gaap_AmortizationOfIntangibleAssets	$ 562us-gaap_AmortizationOfIntangibleAssets	$ 1,074us-gaap_AmortizationOfIntangibleAssets
Cost of net revenues
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	333	334
General and administrative expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	562	562
Total amortization expense
Finite-Lived Intangible Assets [Line Items]
Amortization of purchased intangible assets	$ 895	$ 896