The Company and Summary of Significant Accounting Policies and Estimates (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Sep. 13, 2013	May. 17, 2013	Dec. 31, 2014
Initial Public Offering and Follow-On Offering
Aggregate proceeds from the IPO and concurrent private placement before deduction of offering expenses		$ 87,000
Offering expenses		$ 3,400	$ 62
Number of shares of common stock issued upon automatic conversion of convertible preferred stock		25,876,142
Initial public offering
Initial Public Offering and Follow-On Offering
Shares of common stock sold		6,968,435
Share Price		$ 13.00
Underwriters' overallotment option
Initial Public Offering and Follow-On Offering
Shares of common stock sold		908,926
Share Price		$ 13.00
Selling Stockholders'
Initial Public Offering and Follow-On Offering
Shares of common stock sold	5,337,502	309,509
Share Price		$ 13.00
Private Placement
Initial Public Offering and Follow-On Offering
Shares of common stock sold		500,000
Share Price		$ 13.00
Follow-on offering
Initial Public Offering and Follow-On Offering
Shares of common stock sold	6,000,000
Share Price	$ 35.50
Proceeds from common stock sold	$ 22,500
Offering expenses	$ 700
Common stock sold by the Company
Initial Public Offering and Follow-On Offering
Shares of common stock sold	662,498