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Financial Instruments - Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 14,533,065 | $ 24,987,603
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 14,533,065 | 24,987,603
Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,422,500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 2,422,500 |
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 830,190 | 1,398,928
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 830,190 | 1,398,928
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,280,375 | 23,588,675
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 11,280,375 | $ 23,588,675

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