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Debt, Net - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Convertible Notes        
Debt Instrument [Line Items]        
Interest expense—stated coupon rate $ 3,651 $ 4,064 $ 7,293 $ 7,588
Interest expense—amortization of debt discount 2,464 2,415 4,892 4,901
Total interest expense—convertible notes 6,115 6,479 12,185 12,489
Cabot Senior Secured Notes | Senior Notes        
Debt Instrument [Line Items]        
Total interest expense—convertible notes 21,358 24,046 42,842 47,122
Interest Expense | Cabot Senior Secured Notes | Senior Notes        
Debt Instrument [Line Items]        
Interest expense—stated coupon rate 21,239 25,011 42,839 48,993
Interest expense—amortization of debt discount 119 116 3 226
Interest Income | Cabot Senior Secured Notes | Senior Notes        
Debt Instrument [Line Items]        
Interest expense—amortization of debt discount $ 0 $ (1,081) $ 0 $ (2,097)