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Stock Option Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended		12 Months Ended	6 Months Ended						6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Restricted Stock [Member]	Jun. 30, 2012 Minimum [Member]	Jun. 30, 2011 Minimum [Member]	Jun. 30, 2012 Maximum [Member]	Jun. 30, 2011 Maximum [Member]	Jun. 30, 2012 2004 Stock Incentive Plan [Member]	Jun. 30, 2012 2009 Stock Incentive Plan [Member]	May 31, 2012 2009 Stock Incentive Plan [Member]	Jun. 30, 2012 Options Granted in Previous Years [Member]	Jun. 30, 2012 Options Granted in Previous Years [Member]	Jun. 30, 2012 Options Granted in Previous Years [Member] Restricted Stock [Member]	Jun. 30, 2012 Options Granted in Previous Years [Member] Restricted Stock [Member]	Jun. 30, 2012 Options Granted in Current Year [Member]	Jun. 30, 2012 Options Granted in Current Year [Member]	Jun. 30, 2012 Options Granted in Current Year [Member] Restricted Stock [Member]	Jun. 30, 2012 Options Granted in Current Year [Member] Restricted Stock [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
Increase in stock options reserved by incentive plan										2,300,000
Number of shares reserved prior to increase											4,200,000
Period for options to be vested from date of grant, maximum	10 years
Stock Options [Roll Forward]
Outstanding at December 31, 2011 (in shares)	4,129,749
Granted (in shares)	1,088,280
Expired (in shares)	(400,000)
Forfeited (in shares)	(84,320)
Outstanding at June 30, 2012 (in shares)	4,733,709		4,129,749
Exercise Price per Share [Roll Forward]
Outstanding at December 31, 2011 (in dollars per share)					$ 1.23		$ 15.54
Granted (in dollars per share)					$ 1.43		$ 4.6
Expired (in dollars per share)					$ 3.90		$ 5.85
Forfeited (in dollars per share)					$ 2.26		$ 9.18
Outstanding at June 30, 2012 (in dollars per share)					$ 1.23		$ 15.54
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2011 (in dollars per share)	$ 5.09
Granted (in dollars per share)	$ 3.99
Expired (in dollars per share)	$ 4.95
Forfeited (in dollars per share)	$ 4.75
Outstanding at June 30, 2012 (in dollars per share)	$ 4.86		$ 5.09
Weighted Average Remaining Life Years [Abstract]
Weighted Average Remaining Life (Years)	7 years 2 months 12 days		6 years 4 months 17 days
Recognized compensation expense	$ 1,404	$ 2,208										$ 300	$ 800	$ 100	$ 300	$ 400	$ 600	$ 100	$ 200
Assumptions used to determine the fair value of stock options [Abstract]
Dividend yield (in hundredths)	0.00%	0.00%
Expected volatility (in hundredths)					77.37%	73.90%	(80.30%)	79.11%
Weighted average volatility (in hundredths)	78.91%	74.40%
Risk-free interest rates (in hundredths)					0.78%	1.90%	1.49%	2.54%
Expected life	6 years	6 years
Restricted Stock [Roll Forward]
Outstanding at December 31, 2011 (in shares)				193,532
Granted (in shares)				427,970
Vested (in shares)	(79,843)
Forfeited (in shares)				(13,786)
Outstanding at June 30, 2012 (in shares)				527,873
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2011 (in dollars per share)				$ 5.84
Granted (in dollars per share)				$ 1.54
Vested (in dollars per share)				$ 6.14
Forfeited (in dollars per share)				$ 4.15
Outstanding at June 30, 2012 (in dollars per share)				$ 3.40

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The maximum number of shares available under share-based compensation plans prior to plan amendment.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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 risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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Number of additional shares authorized for issuance under an established share-based compensation plan.

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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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-Publisher FASB

-Name Accounting Standards Codification

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

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Gross number of share options (or share units) granted during the period.

+ References

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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.

+ References

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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.

+ References

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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- Definition

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

+ References

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