Notes Payable (Details) (USD $)	12 Months Ended	84 Months Ended	12 Months Ended					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013 Notes	Mar. 31, 2013 Notes	Dec. 31, 2012 Notes	Jun. 30, 2012 Notes	Jun. 18, 2007 Notes	Dec. 31, 2013 Notes LIBOR
Notes payable
Secured promissory notes issued				$ 1,500,000	$ 4,000,000	$ 7,500,000	$ 200,000
Fixed interest rate (as a percent)			3.00%				8.00%
Basis of interest rate			LIBOR					LIBOR
Margin on base rate								LIBOR Rate Margin
Loss on extinguishment of debt	1,091,000	1,091,000	1,100,000
Payment of debt recorded as interest expense			$ 800,000