Stock Options (Details 4) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Outstanding Stock Options (Fully Vested and Expected to Vest)
Number of outstanding options (in shares)	2,779
Weighted average remaining contractual life	5 years 11 days
Weighted average exercise price per share (in dollars per share)	$ 0.78
Intrinsic value (in thousands)	$ 263
Options that are Exercisable
Number of outstanding options (in shares)	2,012	1,791
Weighted average remaining contractual life	4 years 4 months 10 days
Weighted average exercise price per share (in dollars per share)	$ 0.84	$ 0.89
Intrinsic value (in thousands)	253
Additional disclosures
Total unrecognized compensation cost related to non-vested options	$ 111
Weighted average recognition period	8 months 23 days

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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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Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans, that have yet to vest.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of fully vested and expected to vest options outstanding.

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