Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 06, 2015	Oct. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Completion of IPO [Abstract]
Common stock, shares authorized (in shares)			38,500,000	35,000,000
Preferred stock, shares authorized (in shares)			26,000,000
Common stock, par value (in dollars per share)			$ 0.00033	$ 0.00033
Subsequent Event [Member]
Completion of IPO [Abstract]
Sales price per share (in dollars per share)	$ 11.00
Gross proceeds from issuance of common stock	$ 92.5
Net proceeds from issuance of common stock	83.2
Underwriting discounts, commissions and other offering costs	$ 9.3
Common shares issued upon conversion of preferred stock (in shares)	18,566,856
Preferred stock, shares outstanding (in shares)		0
Common stock, shares authorized (in shares)	75,000,000
Preferred stock, shares authorized (in shares)	5,000,000
Common stock, par value (in dollars per share)	$ 0.00033
Subsequent Event [Member] | IPO [Member]
Completion of IPO [Abstract]
Shares of common stock sold (in shares)	8,412,423
Subsequent Event [Member] | Over-Allotment Option [Member]
Completion of IPO [Abstract]
Shares of common stock sold (in shares)	1,097,272