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Earnings per Share

12 Months Ended

Dec. 31, 2022

Earnings per ShareBasic EPS excludes dilution and is computed by dividing net loss attributable to common stockholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock using the treasury stock method. Potentially dilutive securities (consisting primarily of the convertible notes calculated using the if-converted and treasury stock method and warrants, stock options and RSUs calculated using the treasury stock method) are excluded from the diluted EPS computation in loss periods and when the applicable exercise price is greater than the market price on the period end date as their effect would be anti-dilutive.

The calculation of basic and diluted earnings per share was as follows (in thousands, except share and per share data):


	Year Ended December 31,
	2022		2021		2020
Net loss attributable to common stockholders	$	(70,705)	$	(52,368)	$	(114,119)
Weighted-average common shares outstanding	107,269,331		103,246,308		96,111,547
Basic and diluted net loss per share	$	(0.66)	$	(0.51)	$	(1.19)

The following is a summary of outstanding potential shares of common stock that have been excluded from the computation of diluted net loss per share attributable to common stockholders because their inclusion would have been anti-dilutive:


	Year Ended December 31,
(in thousands)	2022	2021	2020
Convertible notes	14,090	14,341	14,784
Warrants	—	2,500	2,500
Non-qualified stock options	8,133	8,086	8,480
Restricted stock units	1,178	1,248	417
Employee Stock Purchase Plan	426	144	25
Total	23,827	26,319	26,206