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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2014
Fair Value Measurements [Abstract] |
Financial assets and liabilities carried at fair value | Financial assets and liabilities carried at fair value as of September 30, 2014 and December 31, 2013 were classified as follows (in thousands):
|  | Fair Value Measurements at September 30, 2014 Using |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 34,566 |  |  | $ | - |  |  | $ | - |  |  | $ | 34,566 |
U.S. treasury securities |  |  | 5,000 |  |  |  | - |  |  |  | - |  |  |  | 5,000 |
Foreign exchange options |  |  | - |  |  |  | 35 |  |  |  | - |  |  |  | 35 |
Total |  | $ | 39,566 |  |  | $ | 35 |  |  | $ | - |  |  | $ | 39,601 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent warrant liabilities |  | $ | - |  |  | $ | - |  |  | $ | 33,658 |  |  | $ | 33,658 |
|  | Fair Value Measurements at December 31, 2013 Using |  |  |  |
|  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |  |  |  |
|  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |  |  | Total |
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Money market funds (1) |  | $ | 82,759 |  |  | $ | - |  |  | $ | - |  |  | $ | 82,759 |
U.S. treasury securities |  |  | 19,990 |  |  |  | - |  |  |  | - |  |  |  | 19,990 |
Foreign exchange options |  |  | - |  |  |  | 361 |  |  |  | - |  |  |  | 361 |
Total |  | $ | 102,749 |  |  | $ | 361 |  |  | $ | - |  |  | $ | 103,110 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent warrant liabilities |  | $ | - |  |  | $ | - |  |  | $ | 69,869 |  |  | $ | 69,869 |
(1) Included in cash and cash equivalents
Warrant liabilities fair value assumptions | The fair value of the contingent warrant liabilities was estimated using the following range of assumptions at September 30, 2014 and December 31, 2013:
|  | September 30, 2014 |  |  | December 31, 2013 |
Expected volatility |  |  | 43.0% - 68.7 | % |  |  | 66.1% - 86.6 | %
Risk-free interest rate |  |  | 0.0% - 0.6 | % |  |  | 0.1% - 0.8 | %
Expected term |  | 0.2 - 2.4 years |  |  | 0.9 - 3.2 years |
Summary of changes in fair value of Level 3 financial liabilities | The following table provides a summary of changes in the fair value of the Company’s Level 3 financial liabilities for the nine months ended September 30, 2014 (in thousands):
Contingent warrant liabilities |  | September 30, 2014 |
Balance at December 31, 2013 |  | $ | 69,869 |
Reclassification of contingent warrant liability to equity upon exercise of warrants |  |  | (2,526 | )
Net decrease in fair value of contingent warrant liabilities upon revaluation |  |  | (33,685 | )
Balance at September 30, 2014 |  | $ | 33,658 |

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- Definition Tabular disclosure of quantitative information about the inputs used in the fair value measurement of liabilities. This disclosure may include, but is not limited to, the fair value of the liability, valuation technique used to measure fair value, the inputs used to measure fair value, the ranges of the inputs, and the weighted averages of the inputs. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + 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=36462937&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=36462937&loc=d3e19279-110258 + 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=36462937&loc=d3e19190-110258 + Details
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