Options Outstanding (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable, Number of Shares Issuable	3,438,049
Not vested, Number of Shares Issuable	1,410,000
Balance, Number of Shares Issuable	4,848,049
Exercisable, Weighted-Average Exercise Price	$ 1.11
Not vested, Weighted-Average Exercise Price	$ 1.77
Balance, Weighted-Average Exercise Price	$ 1.29
Exercisable, Weighted-Average Remaining Term (Years)	2 years 7 months 6 days
Not vested, Weighted-Average Remaining Term (Years)	4 years 1 month 6 days
Balance, Weighted-Average Remaining Term (Years)	3 years
Exercisable, Aggregate Intrinsic Value	$ 4,500
Not vested, Aggregate Intrinsic Value	0
Balance, Aggregate Intrinsic Value	$ 4,500