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Net Loss Per Share
 12 Months Ended
Dec. 31, 2020
Earnings Per Share [Abstract]  
Net Income (Loss) Per Share NET LOSS PER SHARE
Basic net loss per share is computed by dividing the net loss attributable to common stockholders for the applicable period by the weighted average number of common shares outstanding during the period. Potentially dilutive shares, consisting of outstanding stock options, restricted stock units, ESPP awards, warrants, and the Company’s convertible notes, are excluded from the net loss per share computations when their effect is anti-dilutive.
The diluted net loss per share is the same as basic net loss per share for the years ended December 31, 2020, 2019 and 2018, as the effect of inclusion of potential common shares outstanding would have been anti-dilutive due to the Company’s net losses for the years presented.
The following table sets forth the potential weighted common shares outstanding that were excluded from the diluted net loss per share computations:
December 31,
(in thousands)202020192018
2020 Notes312 1,322 — 
2022 Notes192 n/an/a
Stock options1,603 2,568 3,327 
Restricted stock units3,041 2,955 2,997 
Stock purchase rights under the ESPP531 478 609 
Warrants (1)
— 4,321 1,268 
  Total 5,679 11,644 8,201 
(1) Refer to Note 16, “Warrants,” for additional information.
The Company applies the treasury stock method to determine the potential dilutive effect of the 2020 Notes, 2022 Notes, and 2024 Notes on net earnings per share as a result of the Company's intent and stated policy to settle the principal amount of the 2020 Notes, 2022 Notes, and 2024 Notes in cash. The 2020 Notes, 2022 Notes, and 2024 Notes are excluded from the calculation of diluted earnings per share under the treasury stock method for the periods when their respective conversion prices exceeded the average market price for the Company's common stock.
Under the if-converted method, the 2022 Notes and the 2024 Notes have potential dilutive effect of 6.6 million shares and 13.3 million shares, respectively. Refer to Note 11, “Convertible Notes, Other Debts and Finance Leases,” for additional information on the 2022 Notes and the 2024 Notes.