The following is a reconciliation of the numerator (net loss) and the denominator (number of shares) used in the basic and diluted net loss per share calculations:

	Year Ended December 31,
	2020			2019
Net loss attributable to common stockholders	$	(19,774	)	$	(14,657	)
Weighted average number of shares of common stock		4,621			1,070
Basic and diluted net loss per share	$	(4.28	)	$	(13.70	)

The Company applied the two-class method for calculating net loss per share. The two-class method is an allocation of losses between the holders of common stock and the Company’s participating securities. Net loss attributable to common stockholders is computed by deducting the dividends accumulated for the period on the Series A preferred stock from the Company’s net loss. Interest expense on the Series A preferred stock is calculated using the effective interest method. The adjustment, if any, to the net loss is the portion of the cumulative dividends in excess of the interest expense on the Series A preferred stock. There were no adjustments for cumulative dividends in excess of the interest expense on the Series A preferred stock for the years ended December 31, 2020 and 2019.

The Company’s 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. The Company’s shares eligible for phantom stock awards (non-vested shares or non-settled awards) were held by PDL and were outstanding. If equity settlement was elected by the award holder, shares of LENSAR common stock were transferred from PDL’s ownership to award owners. These shares were included in the Company’s computation of weighted-average shares outstanding in the determination of basic net loss per share attributable to common stockholders.

As the Company has reported a net loss for all periods presented, basic and diluted net loss per share attributable to common stockholders are the same for those periods. For the year ended December 31, 2020, the Company excluded 2,050 shares underlying restricted stock awards, from its net loss per diluted share calculations because their effect was anti-dilutive. Under the 2020 Plan, there were zero outstanding restricted stock awards in 2019.