Significant Customers - Additional Information (Detail) - Customer	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Number of significant customer	3	4	3	1
Number of other customers accounted for more than 10% of revenue	0	0	0	0
Trade receivables	10.00%		10.00%
Accounts receivable	72.00%		72.00%		57.00%
Customer One [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue	39.00%	16.00%	37.00%	23.00%
Customer Two [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue	18.00%	15.00%	14.00%
Customer Three [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue	12.00%	14.00%	10.00%
Customer Four [Member] | Customer Concentration Risk [Member]
Revenue, Major Customer [Line Items]
Revenue		11.00%
All Other Customers [Member] | Customer Concentration Risk [Member] | Maximum [Member]
Revenue, Major Customer [Line Items]
Revenue			10.00%	10.00%