Overview and Basis of Presentation - Additional Information (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended			1 Months Ended
	May 31, 2014	Jun. 30, 2014	Jun. 30, 2014 Performance Awards	Jun. 30, 2014 Performance Awards	Jun. 30, 2014 Performance Awards Minimum	Jun. 30, 2014 Performance Awards Maximum	May 31, 2014 IPO
Overview And Basis Of Presentation [Line Items]
Year founded		2007
Reincorporated date		2009-04
Shares of common stock sold in initial public offering							12.8
Initial public offering share price		$ 17.38					$ 9.00
Proceeds from initial public offering, net of underwriting discounts and commissions and other offering expenses	$ 103,100,000	$ 104,377,000
Underwriting discounts and commission on IPO	8,100,000
Offering expenses	3,800,000
Number of shares of common stock issued upon automatic conversion of convertible preferred stock	34.3	34.3
Future period share-based compensation expense		63,800,000
Future period share-based compensation expense, period to recognized		3 years 8 months 12 days
Service condition for performance awards					3 years	4 years
Share-based compensation expense			$ 6,100,000	$ 6,100,000