Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Detail) - Customer	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Number of customers representing 15% or more of accounts receivable	1		1
Number of customers representing 21% or more of accounts receivable					1
Revenue [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance required to be significant customers	13.00%	19.00%	13.00%	18.00%
Number of customers representing 18% or more of revenue				1
Number of customers representing 19% or more of revenue		1
Accounts Receivable | Credit Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Minimum percentage of revenue or gross accounts receivable balance required to be significant customers			15.00%		21.00%