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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Outstanding warrants [Member]
Financial liabilities
Total financial liabilities	$ 5,541,809
Fair Value, Measurements [Member]
Financial assets
Total financial assets	29,230,143
Financial liabilities
Total financial liabilities	18,576,054
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets	821,335
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets	28,408,808
Fair Value, Measurements [Member] | Bond obligation [Member]
Financial liabilities
Total financial liabilities	125,000
Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities
Total financial liabilities	12,909,244
Fair Value, Measurements [Member] | Outstanding warrants [Member]
Financial liabilities
Total financial liabilities	5,541,810
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member]
Financial assets
Total financial assets	29,230,143
Financial liabilities
Total financial liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets	821,335
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets	28,408,808
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Bond obligation [Member]
Financial liabilities
Total financial liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities
Total financial liabilities
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member]
Financial liabilities
Total financial liabilities
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member]
Financial assets
Total financial assets
Financial liabilities
Total financial liabilities	125,000
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Bond obligation [Member]
Financial assets
Total financial assets	125,000	331,250
Financial liabilities
Total financial liabilities	125,000
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities
Total financial liabilities
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member]
Financial assets
Total financial assets		107,968
Financial liabilities
Total financial liabilities
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member]
Financial assets
Total financial assets
Financial liabilities
Total financial liabilities	18,451,054
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents (money market accounts) [Member]
Financial assets
Total financial assets
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Bond obligation [Member]
Financial liabilities
Total financial liabilities
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities
Total financial liabilities	12,909,244
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Outstanding warrants [Member]
Financial liabilities
Total financial liabilities	$ 5,541,810

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=25499696&loc=d3e19207-110258

+ Details

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- Details

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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=25499696&loc=d3e19207-110258

+ Details

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Period Type:	instant

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