Common Stock and Warrant Offering and Reverse Split - Additional Information (Detail) (USD $)	1 Months Ended
	Mar. 22, 2012	Mar. 23, 2012	Mar. 28, 2012	Sep. 30, 2012	Dec. 31, 2011	Aug. 31, 2010	May 31, 2010	Apr. 30, 2009
Stockholders Equity [Line Items]
Stock issued, shares	1,159,445		1,333,361
Common share issued	2			15,966,437	12,919,538
Warrant to purchase common stock	1
Option to purchase additional units to cover over-allotments	45 days
Additional units authorize for issuance	173,916
Public Offering price	$ 9.00
Exercise price of warrant	5.63					4.26	15.00	3.00
Expiration date of warrant	Mar. 28, 2017
Issuance of common stock and warrants			2,666,722
Warrants to purchase shares of common stock			1,333,361			100,000	12,000	33,333
Gross proceeds from issuance of stock and warrants			$ 12,000,000
Net proceeds from issuance of stock and warrants			10,403,000
Stock issued during stock splits		3,324
Reverse stock split ratio		0.1667
Warrant one
Stockholders Equity [Line Items]
Price per share of warrants			$ 5.63
Warrants to purchase shares of common stock			1,333,361
Value of warrants			4,445,000
Closing price of warrant issued			$ 4.20
Warrant, expected life			5 years
Warrant, volatility rate			119.00%
Warrant, risk free interest rate			1.05%
Warrant two
Stockholders Equity [Line Items]
Exercise price of warrant			5.63
Expiration date of warrant			May 02, 2016
Warrants to purchase shares of common stock			46,378
Value of warrants			$ 143,000
Closing price of warrant issued			$ 4.20
Warrant, expected life			4 years 1 month 6 days
Warrant, volatility rate			117.00%
Warrant, risk free interest rate			0.78%