Summary of the Status of the Options Outstanding Under the EIP (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Summary Of Options Outstanding Vested and Remain Unvested [Line Items]
Number Outstanding	15,075,000
Weighted Average Remaining Contractual Life	6 years 11 months 8 days
Weighted Average Exercise Price, Outstanding	$ 0.14
Number Exercisable	10,510,313
Weighted Average Exercise Price, Exercisable	$ 0.15
Range of Exercise Prices - Range 1
Summary Of Options Outstanding Vested and Remain Unvested [Line Items]
Range of Exercise Prices, Lower	$ 0.06
Range of Exercise Prices, Upper	$ 0.11	$ 0.11
Number Outstanding	3,800,000
Weighted Average Remaining Contractual Life	7 years 5 months 1 day
Weighted Average Exercise Price, Outstanding	$ 0.10
Number Exercisable	3,214,583
Weighted Average Exercise Price, Exercisable	$ 0.10
Range of Exercise Prices - Range 2
Summary Of Options Outstanding Vested and Remain Unvested [Line Items]
Range of Exercise Prices, Lower	$ 0.12
Number Outstanding	3,805,000
Weighted Average Remaining Contractual Life	8 years 8 months 19 days
Weighted Average Exercise Price, Outstanding	$ 0.12
Number Exercisable	1,189,063
Weighted Average Exercise Price, Exercisable	$ 0.12
Range of Exercise Prices - Range 3
Summary Of Options Outstanding Vested and Remain Unvested [Line Items]
Range of Exercise Prices, Lower	$ 0.15
Number Outstanding	6,320,000
Weighted Average Remaining Contractual Life	5 years 11 months 12 days
Weighted Average Exercise Price, Outstanding	$ 0.15
Number Exercisable	4,990,000
Weighted Average Exercise Price, Exercisable	$ 0.15
Range of Exercise Prices - Range 4
Summary Of Options Outstanding Vested and Remain Unvested [Line Items]
Range of Exercise Prices, Lower	$ 0.24
Range of Exercise Prices, Upper	$ 0.90
Number Outstanding	1,150,000
Weighted Average Remaining Contractual Life	4 years 10 months 28 days
Weighted Average Exercise Price, Outstanding	$ 0.28
Number Exercisable	1,116,667
Weighted Average Exercise Price, Exercisable	$ 0.28