NET INCOME (LOSS) PER SHARE
12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
NET (LOSS) INCOME PER SHARE NET INCOME (LOSS) PER SHARE
Basic net income (loss) per share is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding during the period. Upon consummation of the Zyla Merger in May 2020, the Company inherited outstanding Zyla warrants to purchase Zyla common stock, which were converted into the right to purchase shares of Assertio’s common stock. As these warrants are exercisable at any time at an exercise price of $0.0016 per share, they represent contingently issuable shares and therefore are included in the number of outstanding shares used for the computation of basic income per share. There were 392,095 unexercised shares of common stock issuable upon the exercise of warrants as of December 31, 2021.

Diluted net income (loss) per share is calculated by dividing the net income (loss) by the weighted-average number of shares of common stock outstanding during the period, plus potentially dilutive common shares, consisting of stock options, awards, and equivalents and convertible debt. The Company uses the treasury-stock method to compute diluted earnings per share with respect to its stock options and equivalents. The Company uses the if-converted method to compute diluted earnings per share with respect to its convertible debt. For purposes of this calculation, options to purchase stock are considered to be potential common shares and are only included in the calculation of diluted net income (loss) per share when their effect is dilutive.

The following table reflects the calculation of basic and diluted earnings per common share for the years ended December 31, 2021 and 2020 (in thousands, except for per share amounts):
Year ended December 31,
20212020
Basic net income (loss) per share  
Net loss$(1,281)$(28,144)
Weighted average common shares and warrants outstanding
43,169 26,209 
Basic net loss per share$(0.03)$(1.07)
Diluted net income (loss) per share
Net loss$(1,281)$(28,144)
Weighted average common shares and share equivalents outstanding
43,169 26,209 
Add: effect of dilutive stock options, awards, and equivalents— — 
Diluted net loss per share$(0.03)$(1.07)
The following table reflects outstanding potentially dilutive common shares that are not included in the computation of diluted net income (loss) per share because, to do so would be anti-dilutive for the years ended December 31, 2021, and 2020 (in thousands):
Year ended December 31,
20212020
2.5% Convertible Notes debt 2021
336 
5.0% Convertible Notes debt 2024
— 1,708 
Stock options, awards and equivalents2,914 2,655 
Total potentially dilutive common shares2,917 4,699