Stockholders' Equity, Registered Public Offerings (Details) (USD $)	1 Months Ended		3 Months Ended	0 Months Ended												0 Months Ended
	Apr. 30, 2012	Oct. 12, 2010	Mar. 31, 2012 Registered Public Offerings [Member]	Apr. 30, 2012 Registered Public Offerings [Member] Common Stock [Member]	Mar. 21, 2012 Registered Public Offerings [Member] Common Stock [Member]	Feb. 22, 2011 Registered Public Offerings [Member] Common Stock [Member]	Jun. 22, 2010 Registered Public Offerings [Member] Common Stock [Member]	Feb. 28, 2010 Registered Public Offerings [Member] Common Stock [Member]	Feb. 22, 2011 Registered Public Offerings [Member] Capital Units [Member]	Jun. 22, 2010 Registered Public Offerings [Member] Capital Units [Member]	Feb. 22, 2011 Registered Public Offerings [Member] Fifteen Month Warrants [Member]	Jun. 22, 2010 Registered Public Offerings [Member] Nine Month Warrants [Member]	Mar. 21, 2012 Registered Public Offerings [Member] Five Year Warrants [Member]	Feb. 22, 2011 Registered Public Offerings [Member] Five Year Warrants [Member]	Jun. 22, 2010 Registered Public Offerings [Member] Five Year Warrants [Member]	Oct. 12, 2010 Securities Purchase Agreement with PharmaBio [Member] Common Stock [Member]	Apr. 27, 2010 Securities Purchase Agreement with PharmaBio [Member] Common Stock [Member]	Oct. 12, 2010 Securities Purchase Agreement with PharmaBio [Member] Capital Units [Member]	Apr. 27, 2010 Securities Purchase Agreement with PharmaBio [Member] Capital Units [Member]	Oct. 12, 2010 Securities Purchase Agreement with PharmaBio [Member] Five Year Warrants [Member]	Apr. 27, 2010 Securities Purchase Agreement with PharmaBio [Member] Five Year Warrants [Member]
Stockholders' Equity [Line Items]
Issuance of common stock, financing (in shares)			16,071,429		16,071,429	10,000,000	2,380,952	1,833,333								158,730	270,154
Issue price of common unit (in dollars per unit)				$ 2.80	$ 2.80			$ 9.00	$ 2.35	$ 4.20								$ 3.15	$ 8.14
Gross proceeds					$ 45,000,000			$ 16,500,000	$ 23,500,000	$ 10,000,000								$ 500,000	$ 2,200,000
Net proceeds from issuance of common stock			42,100,000		42,100,000			15,100,000	21,600,000	9,100,000									2,100,000
Number of days option granted to underwriters	30 days
Number of shares covered under options granted to underwriter (in shares)	2,410,714
Number of shares callable by warrants (in shares)								916,669			5,000,000	1,190,474		5,000,000	1,190,474					79,365	135,077
Number of shares callable per warrant issued (in shares)								0.5			0.5	0.5		0.5	0.5					0.5	0.5
Exercise price of warrants (in dollars per share)								$ 12.75			$ 2.94	$ 4.2	$ 2.80	$ 3.20	$ 6.00					$ 4.1	$ 10.59
Potential proceeds from exercise of warrants																				$ 325,000
Warrant redemption provisions		In addition, upon 20 days' written notice to the holder of the warrant, we may redeem any or all of the warrants at any time within 20 days following the occurrence of a "trading threshold" (as defined below) at a per-warrant redemption price of $0.001. A "trading threshold" will be deemed to have occurred on any date that the reported volume weighted average price (VWAP) for five of the immediately preceding seven consecutive trading days exceeds $6.75, provided that the minimum average daily trading volume of our common stock during the seven-day period is at least 33,333 shares (the price and volume criteria being adjusted to take into account any share dividend, share split or other similar transaction that may occur on or after the issuance).
Notice period for redemption of warrants		20 days
Redemption price of warrants (in dollars per share)		$ 0.001
Number of seven consecutive trading days		5
Number of consecutive trading days		7 days
Volume weighted average price, minimum (in dollars per share)		$ 6.75
Average daily trading volume, minimum (in shares)		33,333
Aggregate beneficial ownership limitation																					9.90%