Note 10. Net Income (Loss) Per Share

Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the periods less shares of common stock subject to repurchase and non-vested stock awards. Diluted net income (loss) per share is computed using the weighted-average number of common shares outstanding and potentially dilutive common shares outstanding during the periods. The dilutive effect of outstanding stock options and restricted stock awards is reflected in diluted earnings per share by application of the treasury stock method. Potentially dilutive common shares consist of common shares issuable upon the exercise of stock options and vesting of restricted stock awards. Potentially dilutive common shares are excluded from the computation of weighted-average number of common shares outstanding in net loss years, as their effect would be anti-dilutive to the computation.

A reconciliation of the numerators and denominators of the basic and diluted net loss per share calculations is as follows (in thousands, except per share data):


	Three Months Ended
	March 31,
	2020		2019
Numerator:
Net loss attributable to AXT, Inc.	$	(178)	$	(1,104)
Less: Preferred stock dividends		(44)		(44)
Net loss available to common stockholders	$	(222)	$	(1,148)
Denominator:
Denominator for basic net loss per share - weighted-average common shares		39,812		39,352
Effect of dilutive securities:
Common stock options		—		—
Restricted stock awards		—		—
Denominator for dilutive net loss per common shares		39,812		39,352
Net loss attributable to AXT, Inc. per common share:
Basic	$	(0.01)	$	(0.03)
Diluted	$	(0.01)	$	(0.03)

Options excluded from diluted net loss per share as the impact is anti-dilutive		2,763		2,654
Restricted stock excluded from diluted net loss per share as the impact is anti-dilutive		941		644

The 883,000 shares of $0.001 par value Series A preferred stock issued and outstanding as of March 31, 2020 and December 31, 2019, valued at $3,532,000, are non-voting and non-convertible preferred stock with a 5.0% cumulative annual dividend rate payable when declared by the board of directors and a $4 per share liquidation preference over common stock, which must be paid before any distribution is made to common stockholders. These preferred shares were issued to Lyte Optronics, Inc. stockholders in connection with the completion of our acquisition of Lyte Optronics, Inc. on May 28, 1999.