United states securities and exchange commission

Reclassification of gain on marketable    securities to earnings			—				—					—				—				—				—				—				1				—					1
Net loss			—				—					—				—				—				—				—				—				(41,427	)				(41,427	)
Balances at December 31, 2014			14,604				88,989					7,476				1				(1,128	)			(1	)			14,392				—				(89,923	)				(75,531	)
Exercise of common stock options			—				—					223				—				—				—				349				—				—					349
Vesting of common stock subject to repurchase			—				—					—				—				—				—				48				—				—					48
Stock-based compensation			—				—					—				—				—				—				9,236				—				—					9,236
Exercise of redeemable convertible preferred stock    warrant			373				4,149					—				—				—				—				—				—				—					—
Issuance of common stock in relation to Initial Public    Offering, net of offering cost incurred of $3,936			—				—					5,060				1				—				—				71,356				—				—					71,357
Conversion of redeemable convertible preferred stock    to common stock			(14,977	)			(93,770	)				15,652				2				—				—				93,768				—				—					93,770
Cancellation of restricted stock awards			—				—					(43	)			—				—				—				—				—				—					—
Deemed dividends to investors			—				632					—				—				—				—				(632	)			—				—					(632	)
Net loss			—				—					—				—				—				—				—				—				(52,978	)				(52,978	)