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Stock Options Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	6 Months Ended		12 Months Ended	3 Months Ended		6 Months Ended												3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2012 Stock Options [Member]	Jun. 30, 2013 Minimum [Member]	Jun. 30, 2013 Minimum [Member] Stock Options [Member]	Jun. 30, 2012 Minimum [Member] Stock Options [Member]	Jun. 30, 2013 Maximum [Member]	Jun. 30, 2013 Maximum [Member] Stock Options [Member]	Jun. 30, 2012 Maximum [Member] Stock Options [Member]	Jun. 30, 2013 2004 Stock Incentive Plan [Member]	Jun. 30, 2013 2009 Stock Incentive Plan [Member]	Jun. 30, 2013 Options granted to employees [Member] Stock Options [Member]	Jun. 30, 2012 Options granted to employees [Member] Stock Options [Member]	Jun. 30, 2013 Options granted to employees [Member] Stock Options [Member]	Jun. 30, 2012 Options granted to employees [Member] Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for the issuance (in shares)																	3,000,000	6,500,000
Period for options to be vested from date of grant, maximum	10 years
Stock Options [Roll Forward]
Outstanding at December 31, 2012 (in shares)		4,788,887
Granted (in shares)		923,220
Forfeited (in shares)		(517,441)
Expired (in shares)		(20,000)
Outstanding at March 31, 2013 (in shares)	5,174,666	5,174,666		4,788,887
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding at December 31, 2012 (in dollars per share)											$ 1.23			$ 15.54
Granted (in dollars per share)											$ 0.46			$ 2.13
Forfeited (in dollars per share)											$ 1.31			$ 8.50
Expired (in dollars per share)											$ 1.87			$ 1.87
Outstanding at March 31, 2013 (in dollars per share)											$ 0.46			$ 15.54
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2012 (in dollars per share)		$ 4.79
Granted (in dollars per share)		$ 2.08
Forfeited (in dollars per share)		$ 3.45
Expired (in dollars per share)		$ 1.87
Outstanding at March 31, 2013 (in dollars per share)	$ 4.45	$ 4.45		$ 4.79
Weighted Average Remaining Life [Abstract]
Weighted Average Remaining Life		6 years 9 months		6 years 10 months 17 days
Recognized compensation expense		$ 571	$ 1,404		$ 100	$ 200	$ 200	$ 500											$ 100	$ 700	$ 600	$ 1,400
Assumptions used to determine the fair value of stock options [Abstract]
Dividend yield (in hundredths)									0.00%	0.00%
Expected volatility (in hundredths)												86.16%	77.37%		93.68%	80.30%
Weighted average volatility (in hundredths)									86.21%	78.91%
Risk-free interest rates (in hundredths)												0.99%	0.78%		1.36%	1.49%
Expected life									6 years 9 months 18 days	6 years
Restricted Stock [Roll Forward]
Outstanding at December 31, 2012 (in shares)							501,468
Granted (in shares)							259,750
Vested (in shares)							(307,488)
Forfeited (in shares)							(56,985)
Outstanding at March 31, 2013 (in shares)					396,745		396,745
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2012 (in dollars per share)							$ 3.26
Granted (in dollars per share)							$ 0.43
Vested (in dollars per share)							$ 2.54
Forfeited (in dollars per share)							$ 4.18
Outstanding at March 31, 2013 (in dollars per share)					$ 1.82		$ 1.82

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Exercise price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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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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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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