We used the treasury stock method for calculating any potential dilutive effect of the conversion of the 2019 Notes on diluted net loss per share for the three months ended March 31, 2020. Upon us adopting ASU 2020-06 using the modified retrospective transition method on January 1, 2021, we applied the “if-converted” method for calculating any potential dilutive effect of the conversion of the 2019 Notes on diluted net loss per share for the three months ended March 31, 2021.

The following table provides a reconciliation of the numerator and denominator used in computing basic and diluted net loss per share for the periods presented (in thousands, except per share amounts):

	Three Months Ended March 31,
	2021			2020
Numerator:
Net loss	$	(9,416	)	$	(4,326	)
Denominator:
Weighted-average shares outstanding — basic and diluted		23,671			22,412
Net loss per share — basic and diluted	$	(0.40	)	$	(0.19	)

The following table presents the outstanding shares of our common stock equivalents and the potential dilutive effect of the conversion of the 2019 Notes excluded from the computation of diluted net loss per share as of the dates presented because their effect would have been antidilutive (in thousands):

	Three Months Ended March 31,
	2021		2020
Stock options		2,723		3,181
Restricted stock units and restricted stock units with performance conditions		779		708
Employee stock purchase plan shares		28		40
2019 Notes		2,496		—