Net Income (loss) per Share Attributable to Common Stock

Net income (loss) per share attributable to common stock is computed by dividing the net income (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 income (loss) attributable to common stock per share whenever doing so would be dilutive.

The Company calculates basic and diluted net income (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 income (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, 2017, the Company only had one class of participating security, common stock. Diluted net income (loss) per share attributable to common stock is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period.

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



	Three Months Ended June 30,					Six Months Ended June 30,
	2018		2017			2018			2017

Numerator:
Net income (loss)	$	3,207	$	4,304		$	(33,232	)	$	(23,762	)
Accretion of preferred stock	—		(110,921		)	—			(135,690		)
Net income (loss) attributable to common stock - basic and diluted	$	3,207	$	(106,617	)	$	(33,232	)	$	(159,452	)
Denominator:
Weighted average shares:
Basic	83,164,670		14,913,234			82,590,979			14,840,759
DIlutive shares from stock plans	7,578,508		—			—			—
Diluted	90,743,178		14,913,234			82,590,979			14,840,759
Net income (loss) per share:
Net income (loss) per share attributable to common stock - basic	$	0.04	$	(7.15	)	$	(0.40	)	$	(10.74	)
Net income (loss) per share attributable to common stock - diluted	$	0.04	$	(7.15	)	$	(0.40	)	$	(10.74	)

The following outstanding shares of common stock equivalents as of June 30, 2018 and June 30, 2017 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:



	Three Months Ended June 30,		Six Months Ended June 30,
	2018	2017	2018	2017

Redeemable convertible preferred stock	—	55,422,002	—	55,422,002
Options to purchase common stock	—	13,782,401	10,775,812	13,782,401
Restricted stock units	179,712	—	2,010,186	—
Total	179,712	69,204,403	12,785,998	69,204,403