Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Changes in Fair Value of Level 3 Financial Liabilities (Details)

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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
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.