Investments in Marketable Securities - Summary of Investments Classified As Available-For-Sale Securities (Detail) - USD ($) |
Sep. 30, 2015 |
Dec. 31, 2014 |
---|---|---|
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | $ 16,623,402 | |
Gross Unrealized Gains | 975 | |
Gross Unrealized Losses | (5,823) | |
Aggregate Estimated Fair Value | 16,618,554 | $ 0 |
Money market funds [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 1,269,047 | |
Aggregate Estimated Fair Value | 1,269,047 | |
Certificates of deposit [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 7,089,727 | |
Aggregate Estimated Fair Value | 7,089,727 | |
Corporate debt securities, available-for-sale [Member] | ||
Schedule of Available-for-sale Securities [Line Items] | ||
Amortized Cost | 8,264,628 | |
Gross Unrealized Gains | 975 | |
Gross Unrealized Losses | (5,823) | |
Aggregate Estimated Fair Value | $ 8,259,780 |