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NET INCOME (LOSS) PER COMMON SHARE | 9 Months Ended
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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,
| 2021 |  | 2020 |  | 2021 |  | 2020
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, basic | 183,214 |  |  | 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, diluted | 183,214 |  |  | 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,
| 2021 |  | 2020 |  | 2021 |  | 2020
Options to purchase common stock | 6,649 |  |  | 5,172 |  |  | 6,649 |  |  | 5,175 |
Common stock issuable under the 2024 Notes | 3,970 |  |  | — |  |  | 3,970 |  |  | — |
Common stock issuable under the 2027 Notes | 4,365 |  |  | — |  |  | 4,365 |  |  | — |
Unvested RSUs | 5,292 |  |  | 2,900 |  |  | 5,292 |  |  | 3,060 |
Common stock potentially issuable for ESPP purchases | 582 |  |  | 193 |  |  | 582 |  |  | 204 |
The Company’s common stock held by the NQDC | 197 |  |  | — |  |  | 197 |  |  | — |
Total number of potentially issuable shares | 21,055 |  |  | 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.

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