Restructuring - Schedule of Restructuring Costs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Restructuring costs and Reserve [Line Items]
Total restructuring costs	$ 985
Cost of revenue [Member]
Restructuring costs and Reserve [Line Items]
Total restructuring costs	968
Selling, general and administrative [Member]
Restructuring costs and Reserve [Line Items]
Total restructuring costs	$ 17