Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended
	Apr. 30, 2012	Jun. 30, 2012
Stockholders' Equity Note [Abstract]
Amount of interests and leases available under land agreement		$ 20.0
Warrants exercise price (in dollars per share)		$ 22.09
Warrants expiration date		Aug. 21, 2017
Issuance of warrants to purchase common stock	25,000