Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of Potentially Dilutive Securities Not Included in Calculation of Diluted Net Loss Per Share

Potentially dilutive securities not included in the calculation of diluted net loss per share because to do so would be anti-dilutive are as follows (in common share equivalents):

	Years Ended December 31,
	2015		2014		2013
Redeemable convertible preferred stock outstanding		—		9,238,868		9,238,868
Redeemable convertible preferred stock issuable upon    conversion of convertible promissory note		—		94,455		94,455
Warrants for redeemable convertible preferred stock		—		25,970		18,514
Warrants for common stock		25,970		—		—
Common stock options		2,625,280		1,514,471		821,057
Employee stock purchase plan		17,363		—		—
		2,668,613		10,873,764		10,172,894

Summary of Net Loss Per Share

The following table summarizes our net loss per share (in thousands, except per share data):

	Years Ended December 31,
	2015			2014			2013
Numerator:
Consolidated net loss		(47,973	)		(24,350	)		(20,014	)
Accretion to redemption value		(15	)		(416	)		(1,637	)
Net loss attributable to common stockholders		(47,988	)		(24,766	)		(21,651	)
Denominator:
Weighted average common shares outstanding		15,900,167			895,678			839,348
Weighted average common shares subject to repurchase		(61,814	)		(61,457	)		(76,587	)
Weighted average common shares outstanding - basic and diluted		15,838,353			834,221			762,761
Net loss per share - basic and diluted	$	(3.03	)	$	(29.69	)	$	(28.39	)