Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended		3 Months Ended	0 Months Ended	3 Months Ended		0 Months Ended	3 Months Ended
	May 31, 2013	Apr. 30, 2013	Mar. 31, 2013	May 08, 2013 Hercules loan	Mar. 31, 2013 Hercules loan	Mar. 31, 2013 Subsequent Event	May 08, 2013 Convertible Notes Payable Subsequent Event	Mar. 31, 2012 Convertible Notes Payable Subsequent Event Amended securities purchase agreement	Mar. 31, 2013 Convertible Notes Payable Subsequent Event New Notes
Subsequent Event [Line Items]
Share based compensation expense			$ 42,000
Convertible notes issued						1,000,000	5,633,331	3,200,000	2,433,331
Interest rate of debt					3.00%		2.00%
Debt instrument maturity term							54 months
Conversion price per share						$ 1.60	$ 1.6
Class of warrant or right, number of securities called by warrants or rights					59,324		3,520,833
Per share price of additional shares issuable on unpaid interest							$ 0.01
Loan amount				3,000,000	500,000
Debt instrument intial loan amount				$ 2,000,000
Debt instrument maturity date				Oct. 31, 2013
Percentage of fully diluted shares outstanding				3.50%
Shares granted during period	140,000	140,000
Warrant exercise price				0.1	0.10
Term of class of warrants				10 years	10 years