Net Income (Loss) per Share Attributable to Common Stock (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Basic and Diluted Earnings Per Share

The following table sets forth the calculation of basic and diluted net income (loss) per share attributable to common stock during the periods presented:



	Year End December 31,
	2015			2016			2017

Numerator:
Net income (loss)	$	(30,236	)	$	(22,526	)	$	(15,002	)
Accretion of preferred stock	(102,224		)	(55,502		)	(175,915		)
Net income (loss) attributable to common stock—basic and diluted	$	(132,460	)	$	(78,028	)	$	(190,917	)

Denominator:
Weighted average shares used to compute net income (loss) per share attributable to common stock—basic and diluted	13,416,411			14,395,067			42,722,114
Net income (loss) per share attributable to common stock—basic and diluted	$	(9.87	)	$	(5.42	)	$	(4.47	)

Summary of Antidilutive Securities Excluded from Computation of Earnings Per Share

The following outstanding shares of common stock equivalents were excluded from the computation of the diluted net income (loss) per share attributable to common stock for the periods presented because their effect would have been anti-dilutive. For the year ended December 31, 2017 shares of the redeemable convertible preferred stock were anti-dilutive, but converted to common stock on a one-for-one basis on August 2, 2017 upon the successful completion of the IPO, and as such were included in the weighted average shares outstanding for the period they were outstanding as shares of common stock.



	Year End December 31,
	2015	2016	2017

Redeemable convertible preferred stock	55,422,002	55,422,002	—
Options outstanding	10,406,277	13,291,684	13,180,950
Restricted stock units	—	—	981,276
Total	65,828,279	68,713,686	14,162,226