Stock Based Compensation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Summary of stock options and stock option activity
Options Available for Grant, Beginning Balance	5,130,390
Number of options outstanding, Beginning Balance	13,569,610
Weighted average exercise price per share, Beginning Balance	$ 0.81
Options available for grant, Granted
Number of options outstanding, Granted		1,720,000
Weighted average exercise price per share, Granted
Options available for grant, Exercised	181,848
Number of options outstanding, Exercised	(181,848)
Weighted Average Exercise Price per Share, Exercised	$ 0.20
Options available for grant, Forfeited	18,000
Number of options outstanding, Forfeited	(18,000)
Weighted Average Exercise Price per Share, Forfeited	$ 0.57
Options available for grant, Expired	500,000
Number of options outstanding, Expired	(500,000)
Weighted Average Exercise Price per Share, Expired	$ 0.71
Options Available for Grant, Ending Balance	5,830,238
Number of options outstanding, Ending Balance	12,869,762
Weighted average exercise price per share, Ending Balance	$ 0.82
Weighted Average Remaining Contractual Term -Years	5 years 1 month 13 days
Aggregate Intrinsic Value, Ending Balance	$ 76
Number of option outstanding, Excisable	12,581,762
Weighted Average Exercise Price per Share, Exercisable	$ 0.83
Weighted Average Remaining Contractual Term - Years, Exercisable	5 years 15 days
Aggregate Intrinsic Value, Exercisable	76
Number Outstanding Vested or expected to vest	12,869,762
Weighted Average Exercise Price per Share, Vested	$ 0.82
Weighted Average Remaining Contractual Term - Years, Vested	5 years 1 month 13 days
Aggregate Intrinsic Value, Vested	$ 76