Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Number of Shares Issuable
Balance, Beginning	5,710,125	5,886,261
Granted	3,085,000	300,000
Exercised	(300)	0
Cancelled	(1,292,404)	(476,136)
Balance, Ending	7,502,421	5,710,125
Weighted-Average Exercise Price
Balance, Beginning	$ 1.10	$ 1.11
Granted	$ 0.54	$ 0.72
Exercised	$ 0.88	$ 0
Cancelled	$ 0.36	$ 1.15
Balance, Ending	$ 1.00	$ 1.10