v2.4.0.6

Summary of Option Activity under Plan and Related Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Shares
Outstanding at end of period	3,298,297	1,547,122
Stock Options and Warrants
Shares
Outstanding at beginning of period	2,135,630	1,236,342
Forfeited	(237,333)	(19,220)
Granted	1,400,000	330,000
Outstanding at end of period	3,298,297	1,547,122
Expected to vest	1,476,200	402,698
Options exercisable	878,297	875,958
Weighted Average Exercise Price
Outstanding at beginning of period	$ 1.26	$ 2.47
Forfeited	$ 1.61	$ 1.89
Granted	$ 0.90	$ 0.40
Outstanding at end of period	$ 1.08	$ 2.03
Expected to vest	$ 0.78	$ 2.03
Options exercisable	$ 1.91	$ 2.60
Weighted-average fair value of options granted during the period	$ 0.77	$ 0.32

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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