Common Stock and Preferred Stock (Details) (USD $)	0 Months Ended
	Dec. 07, 2011	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Preferred stock, shares authorized		10,000,000
Preferred stock, par value (in dollars per share)		$ 0.0001
Preferred stock, shares outstanding		0	0
Voting Common Stock
Class of Stock [Line Items]
Common stock, shares authorized		240,000,000	240,000,000
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Common stock, shares outstanding		72,775,685	72,670,673
Non-Voting Common Stock
Class of Stock [Line Items]
Common stock, shares authorized		50,000,000	50,000,000
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Stock distribution agreement, common stock were exchanged on a share-for-share basis for shares of non-voting common stock	10,576,180
Common stock, shares outstanding		0	0