Major Customers - Additional Information (Detail) - distributor	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue, Major Customer [Line Items]
Number of customers	3
Concentration risk, number of customers that Individually Accounted for More Than Ten Percent		3
Sales Revenue, Net
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.00%
Customer Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Concentration risk percentage	10.00%
Customer Concentration Risk | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage		10.00%
Customer A | Customer Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Concentration risk percentage	20.10%	19.40%	17.90%
Customer A | Customer Concentration Risk | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage	20.00%	19.00%
Customer B | Customer Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.20%	12.70%	13.60%
Customer B | Customer Concentration Risk | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage	14.00%	14.00%
Customer C | Customer Concentration Risk | Sales Revenue, Net
Revenue, Major Customer [Line Items]
Concentration risk percentage	12.40%	11.60%	11.60%
Customer C | Customer Concentration Risk | Accounts Receivable
Revenue, Major Customer [Line Items]
Concentration risk percentage	13.00%	11.00%