Restructuring - Schedule of Amount Incurred for Restructuring Expense (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Restructuring costs and Reserve [Line Items]
Total Estimated Expense	$ 985
Incurred	985
Severance Expense [Member]
Restructuring costs and Reserve [Line Items]
Total Estimated Expense	954
Incurred	954
Other Expense [Member]
Restructuring costs and Reserve [Line Items]
Total Estimated Expense	31
Incurred	$ 31