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Fair Value Measurements - Schedule of Significant Assumption Used in Model is Probability (Detail) - Fair Value, Measurements, Recurring [Member] - Level 3 [Member] - Embedded Compound Derivative [Member]
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Probability of an event of default 10.00%
End of term payment $ 245,000
Risk-free interest rate 1.01%
Minimum [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Prepayment penalties 1.00%
Maximum [Member]  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Prepayment penalties 3.00%