Condensed Statements of Convertible Preferred Stock and Stockholders' (Deficit) Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Statement Of Stockholders Equity [Abstract]
Sale of common stock in initial public offering, per share	$ 11.00
Underwriting discounts and commissions and offering expenses	$ 7,003