Net Loss Per Share

Basic net loss per share attributable to common stockholders is computed by dividing the net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period, net of treasury stock. Diluted net loss per share is computed by giving effect to all potential shares of common stock, including our outstanding stock options, outstanding warrants, common stock related to unvested early exercised stock options, common stock related to unvested restricted stock units and awards and convertible senior notes to the extent dilutive, and common stock issuable pursuant to the ESPP. Basic and diluted net loss per share was the same for each period presented, as the inclusion of all potential common shares outstanding would have been anti-dilutive.

The net loss per share attributable to common stockholders is allocated based on the contractual participation rights of the Class A common shares and Class B common shares as if the loss for the period had been distributed. As the liquidation and dividend rights are identical, the net loss attributable to common stockholders is allocated on a proportionate basis.

The following table presents the calculation of basic and diluted net loss attributable to common stockholders per share (in thousands, except per share data):



	Three Months Ended October 31,												Nine Months Ended October 31,
	2018						2017						2018						2017
	Class A			Class B			Class A			Class B			Class A			Class B			Class A			Class B
Net loss per share, basic and diluted:
Numerator:
Allocation of distributed net loss	$	(105,549	)	$	(47,782	)	$	(55,592	)	$	(29,954	)	$	(213,961	)	$	(99,936	)	$	(149,179	)	$	(82,943	)
Denominator:
Weighted-average common shares outstanding	149,855			67,839			135,941			73,247			146,951			68,637			132,851			73,864
Basic and diluted net loss per share	$	(0.70	)	$	(0.70	)	$	(0.41	)	$	(0.41	)	$	(1.46	)	$	(1.46	)	$	(1.12	)	$	(1.12	)

The anti-dilutive securities excluded from the weighted-average shares used to calculate the diluted net loss per common share were as follows (in thousands):



	As of October 31,
	2018	2017
Outstanding common stock options	6,513	7,070
Shares subject to repurchase	—	15
Unvested restricted stock awards, units, and PRSUs	14,302	13,680
Shares related to the convertible senior notes	10,876	15,079
Shares subject to warrants related to the issuance of convertible senior notes	14,379	15,079
Shares issuable pursuant to the ESPP	418	375
	46,488	51,298