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NET INCOME (LOSS) PER COMMON SHARE
 6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
NET INCOME (LOSS) PER COMMON SHARE NET INCOME (LOSS) PER COMMON SHAREPotentially 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
June 30,		Six Months Ended
June 30,
2021202020212020
Numerator:
Net Income (loss), basic and diluted$12,941 $(29,183)$30,312 $52,198 
Denominator:
Weighted-average common shares outstanding, basic182,844 180,729 182,311 180,314 
Effect of dilutive securities:
Options to purchase common stock748 — 878 1,770 
Unvested RSUs1,365 — 1,425 1,733 
Common stock potentially issuable for ESPP purchases273 — 278 317 
The Company’s common stock held by the NQDC197 — 197 210 
Weighted-average common shares outstanding, diluted185,427 180,729 185,089 184,344 
Net income (loss) per common share, basic$0.07 $(0.16)$0.17 $0.29 
Net income (loss) per common share, diluted$0.07 $(0.16)$0.16 $0.28 
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 June 30,Six Months Ended
June 30,
2021202020212020
Options to purchase common stock6,478 7,157 6,348 5,386 
Common stock issuable under the 2020 Notes— 3,983 — 3,983 
Common stock issuable under the 2024 Notes3,970 3,970 3,970 3,970 
Common stock issuable under the 2027 Notes4,365 4,365 4,365 4,365 
Unvested RSUs3,349 4,832 3,290 3,099 
Common stock potentially issuable for ESPP purchases342 574 337 257 
Total number of potentially issuable shares18,504 25,091 18,310 21,060 
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 six months ended June 30, 2020, as the Company’s closing price on June 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.