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Financial Instruments - Cash and Cash Equivalents Held in Investment Portfolio (Detail) - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 21,185,263	$ 24,987,603
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	21,185,263	24,987,603
Cash [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	506,685	1,398,928
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	506,685	1,398,928
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,678,578	23,588,675
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	$ 20,678,578	$ 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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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ 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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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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