Stockholders' Equity - Common and Preferred Shares (Details) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Summary of the Company's outstanding common stock warrants
Total Number of Warrants Outstanding	13	13
Committed Equity Financing Facility [Member]
Summary of the Company's outstanding common stock warrants
Date of Issuance	Feb. 19, 2008
Exercise Price	657.60
Total Number of Warrants Outstanding	1	1
Direct Registration Series I Warrants [Member]
Summary of the Company's outstanding common stock warrants
Date of Issuance	Jul. 20, 2009
Exercise Price	504.00
Total Number of Warrants Outstanding	12	12