Fair Value Measurements Derivative Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Embedded Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ (1,391)	$ 1,015
Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	(17,145)	(12,123)
Debt Prepayment Derivative [Member] | Contingent Consideration Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	(14,060)	(9,131)
Fair Value, Inputs, Level 1 [Member] | Embedded Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	(1,391)	1,015
Fair Value, Inputs, Level 1 [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 1 [Member] | Debt Prepayment Derivative [Member] | Contingent Consideration Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 2 [Member] | Embedded Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 2 [Member] | Debt Prepayment Derivative [Member] | Contingent Consideration Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	0	0
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	(17,145)	(12,123)
Fair Value, Inputs, Level 3 [Member] | Debt Prepayment Derivative [Member] | Contingent Consideration Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair Value, Net Asset (Liability)	$ (14,060)	$ (9,131)