Stockholders' Equity (Details) (USD $)	6 Months Ended
	Jun. 30, 2013
Award requisite service period	10 years
Exercise price range, lower range limit (usd per share)	$ 0.26
Exercise price range, upper range limit (usd per share)	$ 2.81
Award vesting period	0 years
Stock Options [Member]
Purchase price premium (percent)	110.00%
Equity Incentive Plan of 2009 [Member]
Date established	Jun. 24, 2009
Number of shares authorized (shares)	15,000,000
Equity Incentive Plan of 2009 [Member] | Consultants [Member]
Award requisite service period	10 years
Number of options granted (shares)	1,500,000
Exercise price range, lower range limit (usd per share)	$ 0.29
Exercise price range, upper range limit (usd per share)	$ 0.50
Equity Incentive Plan of 2009 [Member] | Consultants [Member] | Maximum [Member]
Award vesting period	5 years
Equity Incentive Plan of 2009 [Member] | Consultants [Member] | Minimum [Member]
Award vesting period	1 year
Equity Incentive Plan of 2009 [Member] | Directors and consultants [Member]
Number of options granted (shares)	9,852,466
Exercise price range, lower range limit (usd per share)	$ 0.20
Exercise price range, upper range limit (usd per share)	$ 2.30
Equity Incentive Plan of 2009 [Member] | Directors and consultants [Member] | Stock Options [Member]
Number of options granted (shares)	6,839,370
Equity Incentive Plan of 2009 [Member] | Directors and consultants [Member] | Common Class A [Member]
Number of options granted (shares)	3,013,096