Subsequent Events - Additional Information (Detail) (USD $)	1 Months Ended
	Jul. 25, 2012
Subsequent Event [Line Items]
Series A Convertible Preferred Stock, dividend accrual rate	8.00%
Secured convertible note
Subsequent Event [Line Items]
Gross proceeds from a private offering of secured convertible notes and warrants	4,100,000
Secured convertible notes, maturity date	Jul. 25, 2014
Secured convertible notes, interest rate	12.00%
Secured convertible note | Minimum
Subsequent Event [Line Items]
Amount of proceed to be kept in controlled account as part of security interest to investor	1,000,000
Conversion of Notes into Series A Preferred Stock
Subsequent Event [Line Items]
Secured convertible notes, conversion price at the option of the investors	100.00
Conversion of Notes into Series A Preferred Stock | Minimum
Subsequent Event [Line Items]
Conversion into stock, common stock average closing price for 20 consecutive trading days to convert at the option of the company	2.50
Conversion of Notes into Series A Preferred Stock | Product Financing Arrangement | Minimum
Subsequent Event [Line Items]
Conversion into stock, criteria one of two, milestone through potential partner agreement	5,000,000
Conversion into stock, criteria one of two, milestone through additional financing	25,000,000
Conversion of Series A Convertible Preferred Stock into common stock
Subsequent Event [Line Items]
Conversion price at the option of the investors	0.80
Conversion of Series A Convertible Preferred Stock into common stock | Minimum
Subsequent Event [Line Items]
Conversion into stock, common stock average closing price for 20 consecutive trading days to convert at the option of the company	4.00
Warrant
Subsequent Event [Line Items]
Warrant exercise price	1.25
Warrant term	5 years
Percentage of common stock exercisable	75.00%
Warrant redemption price per share at the option of the company	0.01
Warrant redemption per share at the option of the company | Minimum
Subsequent Event [Line Items]
Optional redemption of warrants, minimum per share price of common stock for 20 consecutive trading days at the option of the company	2.50