Summary of Significant Accounting Policies - Summary of Accounts Receivable from Customers in Excess of 10% of Total Accounts Receivable (Detail) - Accounts receivable [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Customer A [Member]
Concentration Risk [Line Items]
Accounts receivable in excess of 10% of total accounts receivable	15.00%	7.00%
Customer B [Member]
Concentration Risk [Line Items]
Accounts receivable in excess of 10% of total accounts receivable	8.00%	14.00%
Customer C [Member]
Concentration Risk [Line Items]
Accounts receivable in excess of 10% of total accounts receivable	6.00%	13.00%
Customer D [Member]
Concentration Risk [Line Items]
Accounts receivable in excess of 10% of total accounts receivable		19.00%