Fair Value of Financial Instruments - Summary of Fair Value of Assets by Level (Detail) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Available-for-Sale Securities
Estimated Fair Value (Level 1 and 2 Inputs)	$ 802,500
Estimated Fair Value (Level 1 and 2 Inputs)	4,901,267
Total Available-for-Sale Securities	5,703,767	$ 5,703,767	$ 0
Total	5,703,767
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Available-for-Sale Securities
Estimated Fair Value (Level 1 and 2 Inputs)	4,901,267
Total Available-for-Sale Securities	4,901,267
Total	4,901,267
Significant Other Observable Inputs (Level 2) [Member]
Available-for-Sale Securities
Estimated Fair Value (Level 1 and 2 Inputs)	802,500
Total Available-for-Sale Securities	802,500
Total	$ 802,500