Employee Equity Incentive Plans (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Number of Options Outstanding (in shares)	13,100,508
Number of Options Exercisable (in shares)	12,062,999
Range of Exercise Prices $0.01 [Member]
Range of Exercise Prices Upper Limit	$ 0.01
Number of Options Outstanding (in shares)	643,465
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	0 years 3 months 22 days
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.01
Number of Options Exercisable (in shares)	643,465
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0.01
Range of Exercise Prices $0.29-$0.45 [Member]
Range of Exercise Prices Lower Limit	$ 0.29
Range of Exercise Prices Upper Limit	$ 0.45
Number of Options Outstanding (in shares)	9,557,043
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	5 years 3 months 7 days
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.32
Number of Options Exercisable (in shares)	8,519,534
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0.31
Range of Exercise Prices $0.60 - $0.70 [Member]
Range of Exercise Prices Lower Limit	$ 0.60
Range of Exercise Prices Upper Limit	$ 0.70
Number of Options Outstanding (in shares)	2,900,000
Options Ouststanding, Weighted-Average Remaining Contractual Life (Years)	5 years 10 months 6 days
Options Ouststanding, Weighted-Average Exercise Price (in dollars per share)	$ 0.68
Number of Options Exercisable (in shares)	2,900,000
Option Exercisable, Weighted- Average Exercise Price (in dollars per share)	$ 0.68