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Warrants Fair Value Assumptions (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Y	Dec. 31, 2011 Y
Assumptions (weighted average)
Volatility	98.00%	85.00%
Expected term (in years)	0.045	0.04
Risk-free rate	0.60%	1.30%
Expected dividends	$ 0	$ 0
All Warrants
Assumptions (weighted average)
Volatility	100.00%	83.00%
Expected term (in years)	4	5
Risk-free rate	0.52%	1.00%
Expected dividends	$ 0	$ 0

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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