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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

X

- Definition

Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments.

+ References

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Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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

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