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Consolidated Balance Sheet Components - Accrued Compensation and Benefits (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Employee-related Liabilities, Current [Abstract]
Salary and related benefits	$ 5,291us-gaap_AccruedSalariesCurrent	$ 4,399us-gaap_AccruedSalariesCurrent
Accrued vacation	3,849us-gaap_AccruedVacationCurrent	4,122us-gaap_AccruedVacationCurrent
Accrued incentive payments	6,609us-gaap_AccruedBonusesCurrent	4,409us-gaap_AccruedBonusesCurrent
Total accrued compensation and benefits	$ 15,749	$ 12,930

Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References+ Details