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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $) | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Financial assets: |  |
Total financial assets | $ 1,699,503 | $ 14,339,896
Financial liabilities: |  |
Total financial liabilities | 8,277,443 |
Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 23,927,887 |
Financial liabilities: |  |
Total financial liabilities | 18,094,881 |
Fair Value, Measurements [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets | 1,426,061 | 13,900,678
Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 521,269 |
Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets | 21,980,557 |
Fair Value, Measurements [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets | 1,426,061 |
Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial assets: |  |
Total financial assets | 231,250 | 331,250
Financial liabilities: |  |
Total financial liabilities | 231,250 |
Fair Value, Measurements [Member] | Loan payable net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 9,586,188 |
Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial assets: |  |
Total financial assets | 42,192 | 107,968
Financial liabilities: |  |
Total financial liabilities | 8,277,443 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 22,501,826 |
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 [Member] |  |
Financial assets: |  |
Total financial assets | 521,269 |
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 | 21,980,557 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets |  |
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 net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets | 1,426,061 |
Financial liabilities: |  |
Total financial liabilities | 273,442 |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [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 [Member] |  |
Financial assets: |  |
Total financial assets |  |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Debt securities [Member] | Marketable securities [Member] |  |
Financial assets: |  |
Total financial assets | 1,426,061 |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Bond obligation [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 231,250 |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Loan payable net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities |  |
Significant Other Observable Inputs Level 2 [Member] | Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 42,192 |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] |  |
Financial assets: |  |
Total financial assets |  |
Financial liabilities: |  |
Total financial liabilities | 17,821,439 |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Money market funds [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member] |  |
Financial assets: |  |
Total financial assets |  |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Debt securities [Member] | Marketable securities [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 net of discounts [Member] |  |
Financial liabilities: |  |
Total financial liabilities | 9,586,188 |
UNobservable Inputs (Level 3) [Member] | Fair Value, Measurements [Member] | Warrant liabilities [Member] |  |
Financial liabilities: |  |
Total financial liabilities | $ 8,235,251 |

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- 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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- 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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