Subsequent Events (Details) (USD $)	1 Months Ended		6 Months Ended
	Jul. 31, 2012	Aug. 31, 2007	Jun. 30, 2012	Dec. 31, 2011
Subsequent Events (Textual) [Abstract]
Proceeds from issue of common stock through ATM program			$ 20,000,000,000
Remaining Available Common Stock under the ATM Program	19,300,000
Subsequent Events (Additional Textual) [Abstract]
Common stock, shares issued	30,519,319		30,332,217	30,307,538
Common stock, shares outstanding	30,519,319		30,332,217	30,307,538
Warrants Issued to purchase common stock		500,041
Exercise Price of warrants outstanding			8.00
Contractual Term of Warrant			5 years
Issued On 2007 [Member]
Subsequent Events (Textual) [Abstract]
Warrants Outstanding Issued During 2007			346,781
Subsequent Events (Additional Textual) [Abstract]
Warrants Issued to purchase common stock		500,041
Atm Program [Member]
Subsequent Events (Textual) [Abstract]
Number of common stock issued through company ATM program	187,102
Proceeds from issue of common stock through ATM program	$ 700,000
Subsequent Events (Additional Textual) [Abstract]
Common stock, shares issued			187,102