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Financial Instruments - Cash and Cash Equivalents and Restricted Cash (Detail) - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 11,096,895 | $ 14,533,065
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 11,096,895 | 14,533,065
Restricted Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,422,500 | 2,422,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 2,422,500 | 2,422,500
Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 690,078 | 830,190
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 690,078 | 830,190
Cash equivalents [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 7,984,317 | 11,280,375
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 7,984,317 | $ 11,280,375

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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