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Investments - Summary of Short and Long-term Investments (Detail)
Sep. 30, 2015
USD ($)
Schedule Of Held To Maturity Securities [Line Items]  
Commercial notes (due within one year), amortized cost $ 17,539,902
Commercial Notes Due Within One Year  
Schedule Of Held To Maturity Securities [Line Items]  
Gross Unrealized Losses (304,942)
Fair Value $ 17,234,960