Stock Option Activity (Detail) (USD $)	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Number of Shares Issuable
Balance, Beginning		7,502,421	5,710,125
Granted		175,000	3,085,000
Exercised	(300)	(186,225)	(2,500)
Cancelled		(3,363,068)	(1,290,204)
Balance, Ending	7,502,421	4,128,128	7,502,421
Weighted-Average Exercise Price
Balance, Beginning		$ 1.00	$ 1.10
Granted		$ 0.84	$ 0.54
Exercised		$ 0.88	$ 0.88
Cancelled		$ 0.96	$ 0.36
Balance, Ending	$ 1.00	$ 1.04	$ 1.00