EARNINGS (LOSS) PER SHARE

Basic earnings (loss) per share is computed by dividing net income (loss) by the weighted average number of shares outstanding during the period. For periods in which the Company reports net income, diluted net earnings per share is determined by using the weighted average number of common and dilutive common equivalent shares outstanding during the period unless the effect is antidilutive.

The calculations of shares used to compute earnings (loss) per share were as follows (in thousands):



	Three months ended
	March 31, 2020	March 31, 2019
Weighted average shares outstanding—basic	120,992	108,167
Potential dilutive common shares	—	—
Weighted average shares outstanding—diluted	120,992	108,167

Options to purchase the Company's common stock and unvested shares of restricted and performance-based stock and stock units aggregating 11.7 million shares have not been included in the computation of diluted loss per share for the three months ended March 31, 2020 because their effect would have been antidilutive. Options to purchase the Company's common stock, unvested shares of restricted and performance-based stock and stock units, and shares in connection with future purchases under the Company's Amended and Restated 2000 Employee Stock Purchase Plan, as amended (the "ESPP"), aggregating 4.5 million shares have not been included in the computation of diluted loss per share for the three months ended March 31, 2019 because their effect would have been antidilutive.