Options Outstanding (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable, Number of Shares Issuable	3,692,421
Not vested, Number of Shares Issuable	3,810,000
Balance, Number of Shares Issuable	7,502,421	5,710,125	5,886,261
Exercisable, Weighted-Average Exercise Price	$ 1.02
Not vested, Weighted-Average Exercise Price	$ 0.99
Balance, Weighted-Average Exercise Price	$ 1.00	$ 1.10	$ 1.11
Exercisable, Weighted-Average Remaining Term (Years)	3 years 6 months
Not vested, Weighted-Average Remaining Term (Years)	6 years 8 months 12 days
Balance, Weighted-Average Remaining Term (Years)	5 years 1 month 6 days
Exercisable, Aggregate Intrinsic Value	$ 11,000
Not vested, Aggregate Intrinsic Value	35,000
Balance, Aggregate Intrinsic Value	$ 46,000