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Restructuring - Schedule of Components of Restructuring Liabilities (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2017
Restructuring Cost And Reserve [Line Items]        
Restructuring       $ 2,783,000
Employee Severance and Other Benefits        
Restructuring Cost And Reserve [Line Items]        
Restructuring $ 0 $ 0 $ 2,800,000 2,783,000
Cash payments       (2,738,000)
Balance at September 30, 2017 $ 45,000     $ 45,000