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Restructuring - Schedule of Components of Restructuring Liabilities (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 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 $ 2,800,000 2,783,000
Cash payments     (2,523,000)
Balance at June 30, 2017 $ 260,000   $ 260,000