Stock Incentive and Employee Stock Purchase Plans (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Summary of stock option activity
Stock Options outstanding December 31, 2011	4,481
Stock Options outstanding, Granted	176
Stock Options outstanding, Exercised	0
Stock Options outstanding, Cancelled	(375)
Stock Options outstanding December 31, 2012	4,282
Options Exercisable, December 31, 2012	3,839
Weighted Average Exercise Price, December 31, 2011	$ 10.58
Weighted Average Exercise Price, Granted	$ 3.44
Weighted Average Exercise Price, Exercised	$ 0.00
Weighted Average Exercise Price, Cancelled	$ 10.99
Weighted Average Exercise Price, Balance December 31, 2012	$ 10.25
Weighted Average Exercise Price, Options Exercisable, December 31, 2012	$ 10.80
Weighted Average Remaining Contractual Term, Option Outstanding Balance December 31, 2012	4 years 3 months 7 days
Weighted Average Remaining Contractual Term, Options Exercisable	3 years 10 months 24 days
Aggregate Intrinsic Value, Option Outstanding Balance December 31, 2012	$ 0
Aggregate Intrinsic Value, Option Exercisable, December 31, 2012	$ 0

Number of shares reserved for issuance under non-option equity instrument agreements awarded that validly exist and are outstanding, including vested instruments.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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