Notes Payable (Senior 6.25% Convertible Note) (Details) (USD $)	3 Months Ended		6 Months Ended			0 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Mar. 26, 2012 Amended and Restated Senior 6.25% Convertible Note [Member]	Dec. 24, 2010 Amended and Restated Senior 6.25% Convertible Note [Member]	Dec. 24, 2007 Amended and Restated Senior 6.25% Convertible Note [Member]	Jun. 30, 2012 Amended and Restated Senior 6.25% Convertible Note [Member]
Convertible notes
Principal issued							$ 5,500,000	$ 15,000,000
Debt maturity date								Dec. 21, 2013
Debt interest rate								6.25%
Conversion price							$ 1.35
Payments for debt extinguishment costs			66,646	275,041		275,041
Value of shares issued for debt restructuring						760,000
Number of shares issued for debt restructuring						2,000,000
Cash paid to settle debt						2,750,000
Interest paid			65,700	248,643		680,816	350,434	937,000
Gain on extinguishment of debt	345,397		414,484	1,672,575		2,173,033
Number of shares issued for agent fees						586,164
Value of shares issued for agent fees						222,742
Gain (loss) on derivative valuation	709,509	2,959,155	(25,606)	4,588,480
Derivative valuation	1,275,275	4,309,537	1,275,275	4,309,537	1,191,269
Accrued interest payable									203,700
Accrued interest payable currently									$ 81,500