Stockholders' Equity (Equity Distribution Agreement) (Details) (USD $)	6 Months Ended
	Jun. 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%