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Fair Value Measurements - Additional Information (Detail) - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of asset transfer from Level 1 to Level 2 on recurring basis $ 200,000 $ 0
Fair value of asset transfer from Level 2 to Level 1 on recurring basis 0 0
Fair value of liabilities transfer from Level 1 to Level 2 on recurring basis 0 0
Fair value of liabilities transfer from Level 2 to Level 1 recurring basis 0 0
Liabilities measured at estimated fair value on nonrecurring basis   0
Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at estimated fair value on a recurring basis   0
Liabilities measured at estimated fair value on a recurring basis 0 $ 0
Fair Value Measurements, Recurring [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets measured at estimated fair value on a recurring basis 0  
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities measured at estimated fair value on nonrecurring basis $ 0