Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016		Dec. 31, 2015		Mar. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure	$ 53		$ 206
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Volatility rate	55.00%		61.00%
Credit adjusted discount rate	10.00%		12.00%
Dividend rate	10.10%		10.60%
Significant Unobservable Inputs (Level 3) | Minimum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate	11.30%		12.90%
Significant Unobservable Inputs (Level 3) | Maximum
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Discount rate	11.70%		13.30%
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure	$ 53	[1]	$ 206	[2]
Significant Other Observable Inputs (Level 2) | Non-Recurring Fair Value Measurements
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Assets Fair Value Disclosure	$ 43,313				$ 6,386

[1] During the six months ended June 30, 2016, there were no transfers between Level 1 and Level 2, and there were no transfers into and/or out of Level 3.

[2] During the year ended December 31, 2015, there were no transfers between Level 1 and Level 2, and there were no transfers into and/or out of Level 3.