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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail)	Mar. 31, 2016 USD ($)
Financial liabilities:
Total financial liabilities	$ 6,159,671
Fair Value, Measurements [Member]
Financial assets:
Total financial assets	10,406,817
Financial liabilities:
Total financial liabilities	15,434,630
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member]
Financial assets:
Total financial assets	3,244,966
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]
Financial assets:
Total financial assets	7,161,851
Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities:
Total financial liabilities	9,274,959
Fair Value, Measurements [Member] | Warrants [Member]
Financial liabilities:
Total financial liabilities	6,159,671
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member]
Financial assets:
Total financial assets	10,406,817
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	3,244,966
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	7,161,851
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member]
Financial liabilities:
Total financial liabilities	15,434,630
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Loan Payable [Member]
Financial liabilities:
Total financial liabilities	9,274,959
Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Warrants [Member]
Financial liabilities:
Total financial liabilities	$ 6,159,671

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

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- 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

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