Net Loss Per Share

Basic net loss per share is computed by dividing the net loss for the year by the weighted average number of common shares outstanding during the year. Diluted net loss per share is calculated in accordance with the treasury stock method for the outstanding stock options and restricted stock units and reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted to common stock. The dilutive impact of the outstanding Notes and Bonds issued by the Company (discussed in Note 9) has been considered using the "if-converted" method. For the three months ended March 31, 2020 and 2019, basic and diluted net loss per share are the same, as the assumed exercise or settlement of stock options, restricted stock units and the potentially dilutive shares issuable upon conversion of the Notes and Bonds are anti-dilutive.

The following table summarizes potential shares of common stock that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect for the three months ended March 31, 2020 and 2019:




Common Stock Equivalents	2020	2019
Options to purchase common stock	9,615,986	11,027,600
Restricted stock units	2,667,710	1,720,128
Convertible preferred stock	8,456	8,456
Convertible notes	14,585,653	14,585,653
August 2019 Bonds	4,928,859	—
December 2019 Bonds	1,009,450	—
Total	32,816,114	27,341,837