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Fair Value (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value.        
Contingently convertible Series E units liability, Beginning Balance     $ 72,057 $ 66,938
Remeasurement of Series E units $ (2,143) $ 4,944 (3,981) 7,700
Contingently convertible Series E units liability, Ending Balance 68,076 74,638 68,076 74,638
Preferred shares derivative liability, Beginning Balance     57,960 28,150
Preferred shares derivative liability, Issuance       26,922
Remeasurement of preferred shares (580) 141 (700) 598
Preferred shares derivative liability, Ending Balance $ 57,260 $ 55,670 $ 57,260 $ 55,670