Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common Class A [Member]
Common stock, shares authorized	500,000,000	500,000,000
Common Stock, shares, issued	89,404,000	52,091,000
Common stock, shares, outstanding	89,404,000	52,091,000
Common Class B [Member]
Common stock, shares authorized	150,000,000	150,000,000
Common Stock, shares, issued	44,613,000	77,023,000
Common stock, shares, outstanding	44,613,000	77,023,000