Share-Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2013
Stock Option Activity
Stock options outstanding, Beginning balance	2,691,633
Stock options, Shares, Granted	740,000
Stock options, Shares, Exercised	(10,000)
Stock options, Shares, Expired	(71,666)
Stock options, Shares, Forfeited	(228,332)
Stock options outstanding, Ending balance	3,121,635
Stock options exercisable	1,814,140
Weighted Average Exercise Price, Stock options outstanding, Beginning balance	$ 1.86
Stock options Granted, Weighted Average Exercise Price	$ 1.30
Stock options Exercised, Weighted Average Exercise Price	$ 0.65
Stock options Expired, Weighted Average Exercise Price	$ 1.56
Stock options Forfeited, Weighted Average Exercise Price	$ 1.68
Weighted Average Exercise Price, Stock options outstanding, Ending balance	$ 1.76
Stock options Exercised, Weighted Average Exercise Price	$ 2.00
Stock options outstanding, Weighted Average Remaining Contractual Term	7 years 6 months 11 days
Stock options exercisable, Weighted Average Remaining Contractual Term	6 years 5 months 1 day
Stock options outstanding, Aggregate Intrinsic Value	$ 578
Stock options exercisable, Aggregate Intrinsic Value	$ 389

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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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of options outstanding.

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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 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 can acquire the shares reserved for issuance on stock options awarded.

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