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Net Income (Loss) Per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | Net Income (Loss) Per Share Basic net income (loss) per share is computed by dividing net income (loss) by the weighted-average number of common shares outstanding for the period. Diluted net income (loss) per share is computed by dividing the net income (loss) for the period by the weighted average number of common and common equivalent shares outstanding during the period. Diluted net income (loss) per share is computed giving effect to all potential dilutive common stock equivalent shares, including options, restricted stock units and shares to be issued under our ESPP. The dilutive effect of outstanding awards is reflected in diluted net income (loss) per share by application of the treasury stock method. The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020
Numerator: |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | $ | (800) |  |  | $ | 3,452 |
Denominator: |  |  |  |  |  |  |
Shares used in per share calculation – basic |  |  |  |  | 26,620 |  |  | 24,719 |
Dilutive effect of common stock |  |  |  |  | — |  |  | 1,460 |
Shares used in diluted share calculation |  |  |  |  | 26,620 |  |  | 26,179 |
Net income (loss) per share – basic |  |  |  |  | $ | (0.03) |  |  | $ | 0.14 |
Net income (loss) per share – diluted |  |  |  |  | $ | (0.03) |  |  | $ | 0.13 |
For each of the three months ended March 31, 2021 and 2020, we had securities outstanding that could potentially dilute per share amounts, but the shares from the assumed conversion or exercise of these securities were excluded in the computation of diluted net income (loss) per share as their effect would have been anti-dilutive. The number of outstanding anti-dilutive shares that were excluded from the computation of diluted net income (loss) per share consisted of the following (in thousands):
|  |  | Three Months Ended March 31,
|  |  |  |  | 2021 |  | 2020*
Common stock options |  |  |  |  | 363 |  |  | n/a
Restricted stock units |  |  |  |  | 1,090 |  |  | n/a
ESPP |  |  |  |  | 7 |  |  | n/a
Total |  |  |  |  | 1,460 |  |  | n/a
_________ * There were no antidilutive shares for this period.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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