Derivative Financial Instruments (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		100 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2014 Derivative instrument liability Warrants	Dec. 31, 2013 Derivative instrument liability Warrants	Sep. 30, 2013 Derivative instrument liability Warrants	Jun. 30, 2013 Derivative instrument liability Warrants	Mar. 31, 2013 Derivative instrument liability Warrants
Changes in warrants
Balance at the beginning of the period (in shares)	5,647,203			858,469	858,469	858,469	2,265,160	2,265,160
Reclassification of derivative liability to equity during the quarter (in shares)							(1,406,691)
Balance at the end of the period (in shares)	5,647,203		5,647,203	858,469	858,469	858,469	858,469	2,265,160
Changes in derivative instrument liability
Balance at the beginning of the period	$ 1,534			$ 1,534	$ 1,050	$ 973	$ 6,351	$ 5,258
Reclassification of derivative liability to equity during the quarter							(3,575)
Change in fair value of warrants during the quarter	(223)	1,093	(3,993)	(223)	484	77	(1,803)	1,093
Balance at the end of the period	$ 1,311		$ 1,311	$ 1,311	$ 1,534	$ 1,050	$ 973	$ 6,351