Common Stock and Warrant Offering and Reverse Split - Additional Information (Detail) (USD $)	1 Months Ended				6 Months Ended
	May 31, 2012	Mar. 22, 2012	Mar. 23, 2012	Mar. 28, 2012	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2010	May 31, 2010	Apr. 30, 2009
Stockholders Equity [Line Items]
Stock issued, shares	7,000	1,159,445		1,333,361
Common share issued		2			15,819,346	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
Value of warrants					10,000
Stock issued during stock splits			3,324
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 37 days
Warrant, volatility rate				117.00%
Warrant, risk free interest rate				0.78%