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NET INCOME (LOSS) PER COMMON SHARE
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
NET INCOME (LOSS) PER COMMON SHARE NET INCOME (LOSS) PER COMMON SHARE
Potentially issuable shares of common stock include shares issuable upon the exercise of outstanding employee stock option awards, common stock issuable under the Company’s Employee Share Purchase Plan (ESPP), unvested RSUs, the Company’s common stock held by the NQDC and contingent issuances of common stock related to the Company’s convertible debt.
The following table sets forth the computation of basic and diluted earnings per common share (common shares in thousands):
Three Months Ended
September 30,		Nine Months Ended
September 30,
2021202020212020
Numerator:
Net Income (loss), basic$(36,494)$784,803 $(6,182)$837,001 
Add: Interest on convertible notes— 7,070 — 18,333 
Net Income (loss), diluted$(36,494)$791,873 $(6,182)$855,334 
Denominator:
Weighted-average common shares outstanding, basic183,214 181,142 182,616 180,592 
Effect of dilutive securities:
Options to purchase common stock— 1,731 — 1,728 
Common stock issuable under the 2020 notes— 3,983 — 3,983 
Common stock issuable under the 2024 notes— 3,970 — 3,970 
Common stock issuable under the 2027 notes— 4,365 — 2,373 
Unvested RSUs— 1,926 — 1,765 
Common stock potentially issuable for ESPP purchases— 346 — 337 
The Company’s common stock held by the NQDC— 211 — 211 
Weighted-average common shares outstanding, diluted183,214 197,674 182,616 194,959 
Net income (loss) per common share, basic$(0.20)$4.33 $(0.03)$4.63 
Net income (loss) per common share, diluted$(0.20)$4.01 $(0.03)$4.39 
In addition to the equity instruments included in the table above, the table below presents potential shares of common stock that were excluded from the computation of basic and diluted income (loss) per common share as they were anti-dilutive (in thousands):
Three Months Ended September 30,Nine Months Ended
September 30,
2021202020212020
Options to purchase common stock6,649 5,172 6,649 5,175 
Common stock issuable under the 2024 Notes3,970 — 3,970 — 
Common stock issuable under the 2027 Notes4,365 — 4,365 — 
Unvested RSUs5,292 2,900 5,292 3,060 
Common stock potentially issuable for ESPP purchases582 193 582 204 
The Company’s common stock held by the NQDC197 — 197 — 
Total number of potentially issuable shares21,055 8,265 21,055 8,439 
The Company’s 1.50% senior subordinated convertible notes due in October 2020 (the 2020 Notes) matured on October 15, 2020 and were settled in cash. The potential effect of the capped call transactions and potential shares issuable under the 2020 Notes were excluded from the calculation of diluted net income (loss) per share in the three and nine months ended September 30, 2020, as the Company’s closing price on September 30, 2020 did not exceed the conversion price of $94.15 per share. There is no similar capped call transaction associated with the 2024 Notes or the 2027 Notes.