Subsequent Events (Details) (USD $) In Millions, except Share data, unless otherwise specified			0 Months Ended			0 Months Ended
	Jul. 05, 2012	Feb. 21, 2012	Jul. 05, 2012 Founder [Member]	Jul. 05, 2012 Company [Member]	Jul. 05, 2012 Convertible preferred stock [Member]	Jul. 05, 2012 IPO [Member]	Jul. 05, 2012 IPO [Member] Founder [Member]	Jul. 05, 2012 IPO [Member] Company [Member]
Subsequent Events (Textual) [Abstract]
Shares issued under IOP						13,397,500	3,047,500	10,350,000
Number of shares sold			397,500	1,350,000
Offering price of IOP						$ 18.00
Total estimated expenses
Net proceeds form offering						$ 173.3
Outstanding convertible preferred stock					10,462,877
Aggregate of preferred stock converted into common stock						83,703,016
Subsequent Events (Additional Textual) [Abstract]
Common stock	600,000,000	1,750,980
Preferred stock	10,000,000