Stockholders' Equity - Common and Preferred Shares (Details 1) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Summary of the Company's stock option activity under its 2005 Plan
Shares, Options outstanding Beginning Balance	143
Shares, Granted	76
Shares, Forfeited and expired	(29)
Shares, Options outstanding Ending Balance	190	143
Options exercisable at March 31, 2013, Shares	83
Options vested or expected to vest at March 31, 2013, Shares	146
Weighted Average Exercise Price, Options outstanding Beginning Balance	$ 19.73
Weighted Average Exercise Price, Granted	$ 4.38
Weighted Average Exercise Price, Forfeited and expired	$ 13.95
Weighted Average Exercise Price, Options outstanding Ending Balance	$ 14.49	$ 19.73
Options exercisable at March 31, 2013, Weighted Average Exercise Price	$ 20.65
Options vested or expected to vest at March 31, 2013, Weighted Average Exercise Price	$ 16.21
Weighted Average Remaining Contractual Life, Options outstanding Beginning Balance	7 years 11 months 16 days	8 years 7 months 21 days
Weighted Average Remaining Contractual Life, Options outstanding Ending Balance	7 years 11 months 16 days	8 years 7 months 21 days
Options exercisable at March 31, 2013, Weighted Average Remaining Contractual Life	5 years 11 months 1 day
Options vested or expected to vest at March 31, 2013, Weighted Average Remaining Contractual Life	7 years 4 months 17 days
Aggregate Intrinsic Value, options outstanding Beginning Balance
Aggregate Intrinsic Value, Options outstanding Ending Balance
Options exercisable at March 31, 2013, Aggregate Intrinsic Value
Options vested or expected to vest at March 31, 2013, Aggregate Intrinsic Value