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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2014
Fair Value Disclosures [Abstract] |
Summary of Financial Assets and Liabilities Subject to Fair Value Measurements on Recurring Basis | The following table summarizes the conclusions reached as of March 31, 2014 and December 31, 2013:
|  | Balance as of March 31, 2014 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Derivative liability — Series C-1 warrants |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Derivative liability — common stock warrants |  |  | 9,998 |  |  |  | — |  |  |  | — |  |  |  | 9,998 |
Total derivative liability |  | $ | 9,998 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,998 |
|  | Balance as of December 31, 2013 |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Derivative liability — Series C-1 warrants |  | $ | 37 |  |  | $ | — |  |  | $ | — |  |  | $ | 37 |
Derivative liability — common stock warrants |  |  | 12,200 |  |  |  |  |  |  |  |  |  |  | $ | 12,200 |
Total derivative liability |  | $ | 12,237 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,237 |
Summary of Reconciliation of Beginning and Ending Balances for Liabilities Measured at Fair Value on Recurring Basis | A reconciliation of the beginning and ending balances for liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) is as follows:
|  | Three months ended March 31, 2014 |
Beginning balance, December 31, 2013 |  | $ | 12,237 |
Issuance of warrants |  |  | 544 |
Excess of fair value of warrants over proceeds |  |  | 362 |
Adjustment to fair value |  |  | (3,145 | )
Ending balance, March 31, 2014 |  | $ | 9,998 |

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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 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 2: 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=25499696&loc=d3e19207-110258 + 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=25499696&loc=d3e19190-110258 + Details
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