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Financial Instruments - Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 2,448,761 | $ 14,533,065
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 2,448,761 | 14,533,065
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 | 1,210,422 | 830,190
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 1,210,422 | 830,190
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,238,339 | 11,280,375
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 1,238,339 | $ 11,280,375

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