Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Financial Instruments Measured on Recurring Basis (Detail)

v2.4.1.9
Financial Instruments - Financial Instruments Measured on Recurring Basis (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities $ 60,513,000us-gaap_AvailableForSaleSecurities $ 60,311,000us-gaap_AvailableForSaleSecurities
Money market funds [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 1,858,000us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 1,858,000us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value Measurements Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 58,655,000us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 27,151,000us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 31,504,000us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 0us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 0us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 0us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value, available-for-sale securities 60,513,000us-gaap_AvailableForSaleSecurities
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
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