Employee Equity Incentive Plans (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Number of Options, Outstanding (in shares)	13,100,508
Stock Options [Member]
Number of Options, Outstanding (in shares)	14,524,358		15,244,498
Number of Options, Granted (in shares)	275,000		1,143,710
Number of Options, Cancelled (in shares)	(200,000)		(1,765,000)
Number of Options, Exercised (in shares)	(1,498,850)		(98,850)
Number of Options, Outstanding (in shares)	13,100,508		14,524,358
Number of Options, Vested or expected to vest	13,100,508
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0.34		$ 0.34
Weighted Average Exercise Price, Granted (in dollars per share)	$ 0.35	[1]	$ 0.39	[1]
Weighted Average Exercise Price, Cancelled (in dollars per share)	$ 0.32		$ 0.38
Weighted Average Exercise Price, Exercised (in dollars per share)	$ 0.01		$ 0.01
Weighted Average Exercise Price, Outstanding (in dollars per share)	$ 0.38		$ 0.34
Weighted Average Exercise Price, Vested or expected to vest (in dollars per share)	$ 0.38

[1] Approximates the weighted-average fair value.