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Stock Option Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended		12 Months Ended	9 Months Ended								9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2012 Minimum [Member] Stock Options [Member]	Sep. 30, 2011 Minimum [Member] Stock Options [Member]	Sep. 30, 2012 Maximum [Member] Stock Options [Member]	Sep. 30, 2011 Maximum [Member] Stock Options [Member]	Sep. 30, 2012 2004 Stock Incentive Plan [Member]	Sep. 30, 2012 2009 Stock Incentive Plan [Member]	Sep. 30, 2012 Options Granted in Previous Years [Member]	Sep. 30, 2012 Options Granted in Previous Years [Member]	Sep. 30, 2012 Options Granted in Previous Years [Member] Restricted Stock [Member]	Sep. 30, 2012 Options Granted in Previous Years [Member] Restricted Stock [Member]	Sep. 30, 2012 Options Granted in Current Year [Member]	Sep. 30, 2012 Options Granted in Current Year [Member]	Sep. 30, 2012 Options Granted in Current Year [Member] Restricted Stock [Member]	Sep. 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)	1,203,452
Expired (in shares)	(400,000)
Forfeited (in shares)	(99,148)
Outstanding at September 30, 2012 (in shares)	4,834,053		4,129,749
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2011 (in dollars per share)	$ 5.09
Granted (in dollars per share)	$ 3.81
Expired (in dollars per share)	$ 4.95
Forfeited (in dollars per share)	$ 4.98
Outstanding at September 30, 2012 (in dollars per share)	$ 4.78		$ 5.09
Weighted Average Remaining Life [Abstract]
Weighted Average Remaining Life (Years)	6 years 4 months 17 days		7 years 1 month 10 days
Recognized compensation expense	$ 2,159	$ 2,921											$ 300	$ 1,100	$ 100	$ 400	$ 500	$ 1,000	$ 200	$ 400
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%	72.16%	84.47%	75.35%
Weighted average volatility (in hundredths)					79.87%	73.62%
Risk-free interest rates (in hundredths)							0.78%	1.45%	1.49%	3.11%
Expected life					6 years			5 years		6 years
Restricted Stock [Roll Forward]
Outstanding at December 31, 2011 (in shares)				193,532
Granted (in shares)				428,920
Vested (in shares)				(91,910)
Forfeited (in shares)				(15,431)
Outstanding at September 30, 2012 (in shares)				515,111
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2011 (in dollars per share)				$ 5.84
Granted (in dollars per share)				$ 2.84
Vested (in dollars per share)				$ 5.85
Forfeited (in dollars per share)				$ 4.19
Outstanding at September 30, 2012 (in dollars per share)				$ 3.38

X

- Definition

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

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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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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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.

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- Definition

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

+ References

No definition available.

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901



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-Subparagraph (c)(1)(i)-(ii)

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- Definition

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

+ References

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-Name Accounting Standards Codification

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-Subparagraph (c)(1)(i)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

+ References

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585



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