Period of expiration of share-based payment award.

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Weighted Average 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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Represents the number of stock incentive plans of the Company.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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 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 maximum 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 estimated measure of the minimum 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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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

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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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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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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-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 option holders acquired shares when converting their stock options into shares.

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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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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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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Share-Based Payment Arrangements (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Plan	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock incentive plans	2
Options, Outstanding [Roll Forward]
Outstanding, Beginning balance (in shares)	5,249
Granted (in shares)	993
Exercised (in shares)	(77)
Forfeited	(324)
Expired	(423)
Outstanding, Ending balance (in shares)	5,418	5,249
Exercisable (in shares)	4,115
Weighted Average Exercise Price [Roll Forward]
Outstanding, Beginning balance (in dollars per share)	$ 10.94
Granted (in dollars per share)	$ 4.66
Exercised (in dollars per share)	$ 5.54
Forfeited (in dollars per share)	$ 6.00
Expired (in dollars per share)	$ 13.52
Outstanding, Ending balance (in dollars per share)	$ 9.96	$ 10.94
Exercisable (in dollars per share)	$ 11.40
Weighted Average Remaining Contractual Term [Abstract]
Options Outstanding	5 years 9 months 14 days
Options Exercisable	4 years 10 months 20 days
Aggregate Intrinsic Value [Abstract]
Options Outstanding	$ 6,856,000
Options Exercisable	3,798,000
Total compensation expense recognized	3,523,000	3,546,000	6,536,000
Employee stock purchase plan [Abstract]
Cash received from exercises under all share-based payment arrangements	400,000
Employees [Member]
Assumptions used in computing the fair value [Abstract]
Expected term	5 years 3 months 18 days	5 years 3 months 18 days	5 years 4 months 24 days
Former CEO [Member]
Aggregate Intrinsic Value [Abstract]
Estimated requisite service periods	9 years 11 months
Non Employees [Member]
Assumptions used in computing the fair value [Abstract]
Expected term	10 years
Directors and Officers [Member]
Assumptions used in computing the fair value [Abstract]
Expected term	7 years 6 months	7 years 4 months 24 days	7 years 4 months 24 days
Options [Member]
Assumptions used in computing the fair value [Abstract]
Expected volatility, minimum (in hundredths)	74.00%	73.00%	70.00%
Expected volatility, maximum (in hundredths	84.00%	90.00%	85.00%
Expected dividends (in hundredths)	0.00%	0.00%	0.00%
Weighted average expected term (years)	5 years 11 months 5 days	5 years 11 months 16 days	6 years 1 month 10 days
Risk-free rate, minimum (in hundredths)	1.64%	0.76%	0.57%
Risk-free rate, maximum (in hundredths)	2.42%	2.83%	1.71%
Employee stock purchase plan [Abstract]
Total unrecognized compensation	3,200,000
Weighted average periods	2 years
Options [Member] \| Minimum [Member]
Assumptions used in computing the fair value [Abstract]
Expected term	5 years 3 months 18 days	5 years 3 months 18 days	5 years 3 months 18 days
Options [Member] \| Maximum [Member]
Assumptions used in computing the fair value [Abstract]
Expected term	7 years 6 months	10 years	10 years
Performance-based options [Member]
Aggregate Intrinsic Value [Abstract]
Total compensation expense recognized	100,000	100,000	2,000,000
2006 Award [Member] \| Options [Member]
Aggregate Intrinsic Value [Abstract]
Estimated requisite service periods	1 year 6 months
1996 Plan and 2005 Plan [Member] \| Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration term	10 years
Aggregate Intrinsic Value [Abstract]
Weighted average grant-date fair value of options granted (in dollars per share)	$ 3.41	$ 3.74	$ 6.38
Total Intrinsic Value of options exercised	$ 102,000	$ 11,000	$ 174,000
1996 Plan and 2005 Plan [Member] \| Options [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
1996 Plan and 2005 Plan [Member] \| Options [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
1996 Plan and 2005 Plan [Member] \| Restricted stock [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
1996 Plan and 2005 Plan [Member] \| Restricted stock [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
1996 Amended Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance of awards (in shares)	5,000
2005 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance of awards (in shares)	11,450