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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $)	Sep. 30, 2014
Outstanding Warrants [Member]
Financial liabilities:
Total financial liabilities	$ 4,011,736
Fair Value, Measurements [Member]
Financial assets:
Total financial assets	31,986,240
Financial liabilities:
Total financial liabilities	19,980,280
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets:
Total financial assets	1,821,396
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets:
Total financial assets	30,164,844
Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities:
Total financial liabilities	15,968,544
Fair Value, Measurements [Member] | Outstanding Warrants [Member]
Financial liabilities:
Total financial liabilities	4,011,736
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member]
Financial assets:
Total financial assets	31,986,240
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets:
Total financial assets	1,821,396
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets:
Total financial assets	30,164,844
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member]
Financial liabilities:
Total financial liabilities	19,980,280
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities:
Total financial liabilities	15,968,544
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Outstanding Warrants [Member]
Financial liabilities:
Total financial liabilities	$ 4,011,736

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Balance Type:	debit
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- Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Definition

Fair value of financial and nonfinancial obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration