The Company’s basic net loss per share is calculated by dividing the net loss by the weighted-average number of shares of common stock outstanding for the period. For purposes of the calculation of diluted net loss per share options to purchase common stock, restricted stock units and unvested shares of common stock issued upon the early exercise of stock options and business acquisitions are considered common stock equivalents, but have been excluded from the calculation of diluted net loss per share as their effect is antidilutive. Because the Company has reported a net loss for the years ended December 31, 2020, 2019 and 2018, diluted net loss per common share is the same as the basic net loss per share for those years.

The table presents the calculation of basic and diluted net loss per share as follows (in thousands, except per share data):

	Years Ended December 31,
	2020			2019			2018
Numerator:
Net loss attributable to common stockholders	$	(17,507	)	$	(59,937	)	$	(8,857	)
Denominator:
Weighted-average shares used in computing net loss per share, basic and diluted		123,978			115,218			104,618
Net loss per share, basic and diluted	$	(0.14	)	$	(0.52	)	$	(0.08	)

The potential common shares that were excluded from the calculation of diluted net loss per share because their effect would have been antidilutive for the periods presented are as follows (in thousands):

	Years Ended December 31,
	2020		2019		2018
Equity awards to purchase common stock		13,088		15,668		20,057
Unvested shares of common stock issued upon early exercise of stock options and business acquisition		1		31		70
Total		13,089		15,699		20,127