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Summary of Significant Accounting Policies - Summary of Customer Concentration (Detail) - Customer Concentration Risk [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounts Receivable [Member] | Customer A [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 32.00% 94.00%
Accounts Receivable [Member] | Customer E [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 32.00%  
Accounts Receivable [Member] | Customer F [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 25.00%  
Total Revenue [Member] | Customer A [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 12.00% 29.00%
Total Revenue [Member] | Customer D [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 22.00% 36.00%
Total Revenue [Member] | Customer F [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 14.00%  
Total Revenue [Member] | Customer G [Member]    
Concentration Risk [Line Items]    
Concentration risk percentage 13.00%