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Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | [1] | $ 31,828 |
Reclassification of contingent warrant liability to equity upon exercise of warrants |  | (3,552) | $ (2,526)
Ending balance |  | 4,070 |
Warrant Liabilities [Member] |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance |  | 31,828 |
Reclassification of contingent warrant liability to equity upon exercise of warrants |  | (3,552) |
Decrease in estimated fair value of contingent warrant liabilities upon revaluation |  | (24,206) |
Ending balance |  | $ 4,070 |
[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.

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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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