Fair Value of Financial Instruments - Schedule of Fair Value of Financial Liabilities (Detail) $ in Thousands	Sep. 30, 2016 USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
2016 Placement Warrants	$ 4,372
2016 Placement Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
2016 Placement Warrants	4,372
2016 Placement Warrants | Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
2016 Placement Warrants	$ 4,372