Stockholders' Equity (Equity Distribution Agreement) (Details) (USD $)	0 Months Ended		9 Months Ended
	Oct. 05, 2012	Sep. 14, 2012	Sep. 30, 2012
Shares Sold In Current Period [Member]
Number of shares sold under equity distribution agreement			0
Cash proceeds from shares sold under equity distribution agreement			$ 0
Maxim 2010 Agreement [Member]
Number of shares authorized under equity distribution agreement			32,000,000
Fixed commission Rate for gross proceeds $10,000,000 or less			4.00%
Fixed commission rate for gross proceeds in excess of $10,000,000			3.00%
Number of shares sold under equity distribution agreement			520,000
Cash proceeds from shares sold under equity distribution agreement			293,000
Commissions paid on shares sold under equity distribution agreement			12,000
Maxim 2012 Agreement [Member]
Maximum dollar amount of shares under the EDA			75,000,000
Fixed commission Rate for gross proceeds $10,000,000 or less			4.00%
Fixed commission rate for gross proceeds in excess of $10,000,000			3.00%
Number of shares to be sold under the equity distribution agreement	40,000,000	20,000,000
Number of shares sold under equity distribution agreement			10,699,700
Cash proceeds from shares sold under equity distribution agreement			9,268,000
Commissions paid on shares sold under equity distribution agreement			$ 393,000