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Net Income Per Share | 9 Months Ended
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Sep. 30, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | 10. Net Income Per Share Basic net income per share attributable to common stockholders is calculated by dividing the net income attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period. Diluted net income per share attributable to common stockholders is computed by dividing the diluted net income attributable to common stockholders by the weighted average number of common shares outstanding for the period, including potential dilutive common shares assuming dilutive effect of outstanding common stock options, restricted stock units, and common stock warrants. In periods when the Company has incurred a net loss, diluted net loss per share attributable to common stockholders is the same as basic net loss per share attributable to common stockholders because dilutive common shares are not assumed to have been issued if their effect is anti-dilutive. A reconciliation of net income available to common stockholders and the number of shares in the calculation of basic and diluted net income per share follows (in thousands, except share and per share amounts): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended | ​ | Nine Months Ended
​ | ​ | September 30 | ​ | September 30
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Basic net income per common share: | ​ | ​ | ​ | ​ | ​
Numerator: |  |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income |  | $ | 16,796 | ​ | $ | 4,822 | ​ | $ | 50,689 | ​ | $ | 7,387
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares used in computing basic net income per share attributable to common stockholders |  | ​ | 89,571,226 | ​ | ​ | 86,265,297 | ​ | ​ | 88,594,135 | ​ | ​ | 85,364,608
Basic net income per share attributable to common stockholders | ​ | $ | 0.19 | ​ | $ | 0.06 | ​ | $ | 0.57 | ​ | $ | 0.09
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Diluted net income per common share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Numerator: |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net income attributable to common stockholders |  | $ | 16,796 | ​ | $ | 4,822 | ​ | $ | 50,689 | ​ | $ | 7,387
Diluted net income attributable to common stockholders | ​ | $ | 16,796 | ​ | $ | 4,822 | ​ | $ | 50,689 | ​ | $ | 7,387
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares used in computing basic net income per share attributable to common stockholder |  | ​ | 89,571,226 | ​ | ​ | 86,265,297 | ​ | ​ | 88,594,135 | ​ | ​ | 85,364,608
Effect of dilutive securities | ​ | ​ | 10,799,105 | ​ | ​ | 12,704,291 | ​ | ​ | 11,732,086 | ​ | ​ | 13,571,881
Weighted-average shares used in computing diluted net income per share attributable to common stockholders |  | ​ | 100,370,331 | ​ | ​ | 98,969,588 | ​ | ​ | 100,326,221 | ​ | ​ | 98,936,489
Diluted net income per share attributable to common stockholders | ​ | $ | 0.17 | ​ | $ | 0.05 | ​ | $ | 0.51 | ​ | $ | 0.07
​ The following weighted-average outstanding shares of potentially dilutive securities were excluded from the computation of diluted income per share attributable to common stockholders for the period presented because including them would have been antidilutive: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | ​ | Nine Months Ended
​ | ​ | September 30, | ​ | ​ | September 30,
​ | ​ | 2021 |  | 2020 | ​ | ​ | 2021 |  | 2020
Options to purchase common stock | ​ | 1,165,092 |  | 721,202 | ​ | ​ | 860,650 |  | 517,743
Shares issuable under ESPP | ​ | 1,082 | ​ | 2,451 | ​ | ​ | 140 | ​ | 428
Restricted stock units | ​ | 74,123 | ​ | 13,829 | ​ | ​ | 28,654 | ​ | 59,876
Total | ​ | 1,240,297 |  | 737,482 | ​ | ​ | 889,444 |  | 578,047
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