Description of Business and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

	December 31,
	2012	2011
Stock options	17,700,000	25,700,000
Warrants	38,059,303	33,556,783
Unvested stock awards issued under the 2006 Equity Incentive Plan	151,719	370,917
850 shares of Series B redeemable convertible preferred stock	425,000	425,000
	56,336,022	60,052,700