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Fair Value Measurements (Reconciliation of Level 3 Assets and Liabilities) (Details) (Warrants Settleable In Cash [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Warrants Settleable In Cash [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at December 31, 2012	$ 267
Change in fair value of Warrant liability
Balance at March 31, 2013	$ 267

Amount of increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issues, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

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