Summary of Significant Accounting Policies - Schedule of Customers Representing Greater than 10% of Accounts Receivable and Revenue (Detail) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue | Customer A
Concentration Risk [Line Items]
Percentage of concentration risk	47.00%
Revenue | Customer B
Concentration Risk [Line Items]
Percentage of concentration risk	25.00%
Revenue | Customer C
Concentration Risk [Line Items]
Percentage of concentration risk	23.00%
Revenue | Customer D
Concentration Risk [Line Items]
Percentage of concentration risk		48.00%
Revenue | Customer E
Concentration Risk [Line Items]
Percentage of concentration risk		43.00%
Revenue | Customer F
Concentration Risk [Line Items]
Percentage of concentration risk			52.00%
Revenue | Customer G
Concentration Risk [Line Items]
Percentage of concentration risk			40.00%
Accounts Receivable | Customer A
Concentration Risk [Line Items]
Percentage of concentration risk	49.00%
Accounts Receivable | Customer C
Concentration Risk [Line Items]
Percentage of concentration risk	41.00%
Accounts Receivable | Customer E
Concentration Risk [Line Items]
Percentage of concentration risk		94.00%