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Fair Value Measurement (Tables) | 3 Months Ended
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Mar. 31, 2013
Fair Value Measurement [Abstract] |
Financial assets and liabilities measured at fair value | The following table presents financial assets and liabilities measured at fair value as of March 31, 2013:
|  | Fair Value Measurement at Report Date Using |  |  |  |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Unobservable Inputs (Level 3) |  |  | As of March 31, 2013 |
Financial assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 321,197 |  |  | $ | — |  |  | $ | — |  |  | $ | 321,197 |
U.S. Treasury debt obligations |  |  | 6,287,050 |  |  |  | — |  |  |  | — |  |  |  | 6,287,050 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities |  |  | — |  |  |  | 9,817,509 |  |  |  | — |  |  |  | 9,817,509 |
Total financial assets |  | $ | 6,608,247 |  |  | $ | 9,817,509 |  |  | $ | — |  |  | $ | 16,425,756 |
Financial liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bond obligation |  | $ | — |  |  | $ | 281,250 |  |  | $ | — |  |  | $ | 281,250 |
Warrant liabilities |  |  | — |  |  |  | 83,072 |  |  |  | 8,952,060 |  |  |  | 9,035,132 |
Total financial liabilities |  | $ | — |  |  | $ | 364,322 |  |  | $ | 8,952,060 |  |  | $ | 9,316,382 |
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2) | Level 2 Reconciliation The following table presents a roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2) for 2013:
|  | Level 2 Beginning Balance 12/31/12 $ |  |  | Net transfers (to) from Level 1 $ |  |  | Change included in earnings $ |  |  | Unrealized gain |  |  | Settled $ |  |  | Level 2 Ending Balance 03/31/13 $ |
Marketable securities |  |  | 13,900,678 |  |  |  | (4,084,608 | ) |  |  | — |  |  |  | 1,439 |  |  |  | — |  |  |  | 9,817,509 |
Bond obligation |  |  | 331,250 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (50,000 | ) |  |  | 281,250 |
Warrant liabilities |  |  | 107,968 |  |  |  | — |  |  |  | (24,896 | ) |  |  | — |  |  |  | — |  |  |  | 83,072 |
Total |  |  | 14,339,896 |  |  |  | (4,084,608 | ) |  |  | (24,896 | ) |  |  | 1,439 |  |  |  | (50,000 | ) |  |  | 10,181,831 |
Roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) | Level 3 Reconciliation The following table presents a roll forward for liabilities measured at fair value using significant unobservable inputs (Level 3) for 2013:
|  | Warrant Liabilities |
Balance at December 31, 2012 |  | $ | 9,157,397 |
Less fair value of warrants exercised |  |  | (418,841 | )
Add change in fair value of warrants |  |  | 213,503 |
Balance at March 31, 2013 |  | $ | 8,952,059 |

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- Definition Fair value assets measured on recurring basis directly or indirectly observable input reconciliation. + References No definition available. + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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