Warrants (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Reconciliation of the change in value of the Company's warrants
Balance at beginning of period	$ 16,372	$ 5,446
Increase (Decrease) in value of warrants	(13,488)	(2,562)
Balance at June 30, 2012	2,884	2,884
Warrant [Member]
Reconciliation of the change in value of the Company's warrants
Reclassification to shareholders equity upon exercise of warrants