Stockholders' Equity (Details 1)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Reconciliation Of Beginning And Ending Common Stock Outstanding [Abstract]
Balance, end of period	76,467,850	66,071,424
Common Stock [Member]
Reconciliation Of Beginning And Ending Common Stock Outstanding [Abstract]
Balance, beginning of period	66,071,424	60,614,931
Issuance of common stock	10,303,351	5,287,098
Restricted stock-based awards, net of forfeitures	93,075	169,395
Balance, end of period	76,467,850	66,071,424