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Fair Value (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value Disclosures [Abstract]        
Contingently convertible Series E units liability, Beginning Balance     $ 72,057 $ 66,938
Remeasurement of Series E units $ 525 $ (3,588) (3,456) 4,112
Contingently convertible Series E units liability, Ending Balance 68,601 71,050 68,601 71,050
Preferred shares derivative liability, Beginning Balance     57,960 28,150
Preferred shares derivative liability, Issuance       26,922
Remeasurement of preferred shares 3,000 1,750 2,300 2,348
Preferred shares derivative liability, Ending Balance $ 60,260 $ 57,420 $ 60,260 $ 57,420