Net Loss per Share Attributable to Common Stock

Net loss per share attributable to common stock is computed by dividing the net loss attributable to common stock by the weighted-average number of common shares outstanding. The Company has outstanding stock options, restricted stock units, employee stock purchase plan shares, and previously had redeemable convertible preferred stock, which are included in the calculation of diluted net loss attributable to common stock per share whenever doing so would be dilutive.

The Company calculates basic and diluted net loss per share attributable to common stock in conformity with the two-class method required for companies with participating securities. The Company considers all series of redeemable convertible preferred stock to be participating securities. Under the two-class method, net loss attributable to common stock is not allocated to the redeemable convertible preferred stock as the holders of redeemable convertible preferred stock do not have a contractual obligation to share in losses. Upon the conversion of the redeemable convertible preferred stock to common stock on the date of the IPO, or August 2^nd, 2017, the Company only had one class of participating security, common stock. Diluted net loss per share attributable to common stock is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, redeemable convertible preferred stock, options to purchase common stock, restricted stock units, and employee purchase plan shares are considered anti-dilutive securities for all periods presented. Basic and diluted net loss per share attributable to common stock was the same for each period presented.

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



	Three Months Ended March 31,
	2018			2017

Numerator:
Net loss	$	(36,439	)	$	(28,066	)
Accretion of preferred stock	—			(24,770		)
Net loss attributable to common stock—basic and diluted	$	(36,439	)	$	(52,836	)

Denominator:
Weighted average shares used to compute net loss per share attributable to common stock—basic and diluted	82,010,913			14,767,478
Net loss per share attributable to common stock—basic and diluted	$	(0.44	)	$	(3.58	)

The following outstanding shares of common stock equivalents were excluded from the computation of the diluted net loss per share attributable to common stock for the periods presented because their effect would have been anti-dilutive:



	Three Months Ended March 31,
	2018	2017

Redeemable convertible preferred stock	—	55,422,002
Options to purchase common stock	11,821,024	13,022,183
Restricted stock units	1,152,718	—
Employee stock purchase plan shares	156,530	—
Total	13,130,272	68,444,185