Derivative Financial Instruments (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended					88 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Mar. 31, 2013
Changes in warrants
Balance at the beginning of the period (in shares)	2,265,160	2,377,660	2,377,660	2,265,160	2,265,160
Fair value of new warrants issued during the quarter (in shares)				112,500
Reclassification of derivative liability to equity during the quarter (in shares)		(112,500)
Balance at the end of the period (in shares)	2,265,160	2,265,160	2,377,660	2,377,660	2,265,160	2,265,160
Changes in derivative instrument liability
Balance at the beginning of the period	$ 5,258	$ 4,663	$ 4,803	$ 3,317	$ 3,325
Fair value of new warrants issued during the quarter				169
Change in fair value of warrants during the quarter recognized as other expense (income) in the statement of operations	1,093	764	(140)	1,317	(8)	(2,528)
Reclassification of derivative liability to equity during the quarter		(169)
Balance at the end of the period	$ 6,351	$ 5,258	$ 4,663	$ 4,803	$ 3,317	$ 6,351