Equity (Summary of Unvested Stock Options) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013
Number of Shares
Unvested at beginning of year (in shares)	8,377,538
Granted (in shares)	4,021,000
Called/expired (in shares)	(265,002)
Vested (in shares)	(3,565,308)
Unvested at end of year (in shares)	8,568,228
Weighted- Average Grant Date Fair Value
Unvested at beginning of year (in dollars per share)	$ 0.96
Granted (in dollars per share)	$ 3.08
Cancelled/expired (in dollars per share)	$ 2.14
Vested (in dollars per share)	$ 0.94
Unvested at end of year (in dollars per share)	$ 1.94