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. For the three months ended March 31, 2019, the dilutive impact of the outstanding Notes issued by the Company (discussed in Note 9) has been considered using the "if-converted" method. For the three months ended March 31, 2019 and 2018, basic and diluted net loss per share are the same, as the assumed exercise or settlement of stock options, restricted stock units and warrants and the potentially dilutive shares issuable upon conversion of the Notes 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, 2019 and 2018:




Common Stock Equivalents	2019	2018
Options to purchase common stock	11,027,600	9,467,477
Warrants to purchase common stock	—	284,091
Restricted stock units	1,720,128	1,791,886
Convertible preferred stock	8,456	8,456
Convertible notes	14,585,653	—
Total	27,341,837	11,551,910