Summary of Significant Accounting Policies - Schedule of Carrying Value of Investments (Detail) - Measured at fair value on a nonrecurring basis [Member]	Dec. 31, 2014 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment	$ 300,000
Significant unobservable inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investment	$ 300,000