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Fair Value Measurements - Financial Assets and Liabilities Carried At Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Liabilities: [Abstract] |  |  |  |
Contingent warrant liabilities |  | $ 4,070 | $ 31,828 | [1]
Recurring [Member] |  |  |  |
Assets: [Abstract] |  |  |  |
Foreign exchange options | [2] |  | 6 |
Total |  |  | 67,575 |
Liabilities: [Abstract] |  |  |  |
Contingent warrant liabilities |  | 4,070 | 31,828 |
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets: [Abstract] |  |  |  |
Total |  |  | 67,569 |
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |
Assets: [Abstract] |  |  |  |
Foreign exchange options | [2] |  | 6 |
Total |  |  | 6 |
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |  |
Liabilities: [Abstract] |  |  |  |
Contingent warrant liabilities |  | 4,070 | 31,828 |
Recurring [Member] | Money Market Funds [Member] |  |  |  |
Assets: [Abstract] |  |  |  |
Money market funds | [3] | 12,084 | 67,569 |
Recurring [Member] | Money Market Funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |  |  |
Assets: [Abstract] |  |  |  |
Money market funds | [3] | $ 12,084 | $ 67,569 |
[1] | The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited consolidated financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.
[2] | Included in other assets
[3] | Included in cash and cash equivalents

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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=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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