Net Loss Per Share Attributable to Common Stockholders

We present net loss per share attributable to common stockholders in conformity with the two-class method required for participating securities, and we consider all series of our redeemable convertible preferred stock participating securities. We have not allocated net loss attributable to common stockholders to our redeemable convertible preferred stock because the holders of our redeemable convertible preferred stock are not contractually obligated to share in our losses.

We calculate basic net loss per share attributable to common stockholders by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. Diluted net loss per share attributable to common stockholders gives effect to all potential shares of common stock, including common stock issuable upon conversion of our redeemable convertible preferred stock and redeemable convertible preferred stock warrants, stock options, RSUs and common stock warrants to the extent these are dilutive.

We calculated basic and diluted net loss per share attributable to common stockholders as follows (in thousands, except per share amounts):



	Three Months Ended March 31,
	2019			2018
Numerator:
Net loss attributable to common stockholders	$	(41,420	)	$	(52,709	)
Denominator:
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	127,346			126,857
Net loss per share attributable to common stockholders, basic and diluted	$	(0.33	)	$	(0.42	)

Basic net loss per share is the same as diluted net loss per share because we reported net losses for all periods presented. We excluded the following weighted-average potential shares of common stock from our calculation of diluted net loss per share attributable to common stockholders because these would be anti-dilutive (in thousands):



	Three Months Ended March 31,
	2019	2018
Redeemable convertible preferred stock	308,373	308,373
Outstanding stock options	76,584	77,341
Unvested restricted stock units	81,498	58,447
Redeemable convertible preferred stock warrants	249	89
Common stock warrants	—	167
Total	466,704	444,417