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

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

+ References

No definition available.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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 number of grants made 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 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).

+ References

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

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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 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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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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

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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.

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

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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 that were terminated.

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

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- Definition

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Paragraph 28

-Subparagraph (b)

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Stock Options Plans (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
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)	921,220
Forfeited (in shares)	(115,945)
Outstanding at March 31, 2013 (in shares)	5,594,162		4,788,887
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)	$ 3.62
Outstanding at March 31, 2013 (in dollars per share)	$ 4.37		$ 4.79
Weighted Average Remaining Life [Abstract]
Weighted Average Remaining Life	7 years 1 month 17 days		6 years 10 months 17 days
Recognized compensation expense	$ 467	$ 703
Restricted Stock [Member]
Weighted Average Remaining Life [Abstract]
Recognized compensation expense	200	200
Restricted Stock [Roll Forward]
Outstanding at December 31, 2012 (in shares)	501,468
Granted (in shares)	11,850
Vested (in shares)	(85,378)
Forfeited (in shares)	(17,123)
Outstanding at March 31, 2013 (in shares)	410,817
Weighted Average Exercise Price [Roll Forward]
Outstanding at December 31, 2012 (in dollars per share)	$ 3.26
Granted (in dollars per share)	$ 1.42
Vested (in dollars per share)	$ 4.99
Forfeited (in dollars per share)	$ 3.70
Outstanding at March 31, 2013 (in dollars per share)	$ 2.82
Stock Options [Member]
Assumptions used to determine the fair value of stock options [Abstract]
Dividend yield (in hundredths)	0.00%	0.00%
Weighted average volatility (in hundredths)	86.20%	78.75%
Expected life	6 years 9 months 18 days	6 years
Minimum [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding at December 31, 2012 (in dollars per share)	$ 1.23
Granted (in dollars per share)	$ 1.31
Forfeited (in dollars per share)	$ 1.82
Outstanding at March 31, 2013 (in dollars per share)	$ 1.23
Minimum [Member] \| Stock Options [Member]
Assumptions used to determine the fair value of stock options [Abstract]
Expected volatility (in hundredths)	86.16%	77.37%
Risk-free interest rates (in hundredths)	1.16%	1.03%
Maximum [Member]
Stock Options, Exercise Price per Share [Roll Forward]
Outstanding at December 31, 2012 (in dollars per share)	$ 15.54
Granted (in dollars per share)	$ 2.13
Forfeited (in dollars per share)	$ 8.50
Outstanding at March 31, 2013 (in dollars per share)	$ 15.54
Maximum [Member] \| Stock Options [Member]
Assumptions used to determine the fair value of stock options [Abstract]
Expected volatility (in hundredths)	86.51%	79.24%
Risk-free interest rates (in hundredths)	1.36%	1.49%
2004 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for the issuance (in shares)	3,000,000
2009 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for the issuance (in shares)	6,500,000
Options granted to employees [Member] \| Stock Options [Member]
Weighted Average Remaining Life [Abstract]
Recognized compensation expense	$ 500	$ 700