Equity Incentive Plans (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013
Number Outstanding (in shares)	16,463,508
Number Of Option Exercisable (in shares)	12,081,753
Exercise Price Range Zero Point Zero One [Member]
Range of Exercise Prices Upper Limit	$ 0.01
Number Outstanding (in shares)	643,465
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	6 months
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.01
Number Of Option Exercisable (in shares)	643,465
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0.01
Exercise Price Range Zero Point One Two To Zero Point One Seven [Member]
Range Of Exercise Prices Lower Limit	$ 0.12
Range of Exercise Prices Upper Limit	$ 0.17
Number Outstanding (in shares)	3,813,000
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	9 years 9 months 18 days
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.16
Number Of Option Exercisable (in shares)	0
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0
Exercise Price Range Zero Point Two Nine To Zero Point Four Five [Member]
Range Of Exercise Prices Lower Limit	$ 0.29
Range of Exercise Prices Upper Limit	$ 0.45
Number Outstanding (in shares)	9,107,043
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	4 years 2 months 12 days
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.31
Number Of Option Exercisable (in shares)	8,538,288
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0.31
Exercise Price Range Zero Point Six Zero To Zero Point Seven Zero [Member]
Range Of Exercise Prices Lower Limit	$ 0.60
Range of Exercise Prices Upper Limit	$ 0.70
Number Outstanding (in shares)	2,900,000
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	5 years 2 months 12 days
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.68
Number Of Option Exercisable (in shares)	2,900,000
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0.68