Summary of Significant Accounting Policies - Schedule of Revenue by Major Customers by Geographic Area (Parenthetical) (Detail) - Revenue [Member] - Geographic Concentration Risk [Member]	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
United States [Member]
Concentration Risk [Line Items]
Revenue	78.00%	29.00%	74.00%	12.00%
Australia [Member]
Concentration Risk [Line Items]
Revenue		24.00%		27.00%
Australia [Member] | Maximum [Member]
Concentration Risk [Line Items]
Revenue	10.00%		10.00%
United Kingdom [Member]
Concentration Risk [Line Items]
Revenue		15.00%		17.00%
United Kingdom [Member] | Maximum [Member]
Concentration Risk [Line Items]
Revenue	10.00%		10.00%
Germany [Member]
Concentration Risk [Line Items]
Revenue		14.00%		17.00%
Germany [Member] | Maximum [Member]
Concentration Risk [Line Items]
Revenue	10.00%		10.00%