Summary of Significant Accounting Policies - Schedule of Revenue or Accounts Receivable by Major Customers (Detail) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Customer A [Member] | Revenue [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage		33.00%
Customer B | Revenue [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage		14.00%	11.00%
Customer B | Accounts Receivable [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	25.00%	46.00%
Customer C | Revenue [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	41.00%		44.00%
Customer C | Accounts Receivable [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage		40.00%
Customer D | Accounts Receivable [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage		11.00%
Customer E | Revenue [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage			21.00%
Customer F | Revenue [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	16.00%
Customer F | Accounts Receivable [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	42.00%
Customer G | Revenue [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	22.00%
Customer G | Accounts Receivable [Member]
Entity Wide Revenue Major Customer [Line Items]
Concentration risk percentage	19.00%