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INCOME (LOSS) PER SHARE | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
INCOME (LOSS) PER SHARE | INCOME (LOSS) PER SHARE Basic net income (loss) per share is computed using the weighted-average number of common shares outstanding during the period. Diluted net income (loss) per share is computed using the weighted-average number of common shares and the effect of potentially dilutive securities outstanding during the period. Potentially dilutive securities include stock options, restricted stock units, performance share units, performance bonus awards, ESPP shares, warrants and convertible senior notes. If dilutive, those potentially dilutive securities are reflected in diluted net income (loss) per share using the treasury stock method, except for the convertible senior notes, which are subject to the if-converted method. The following table sets forth the computation of basic and diluted net income (loss) per share of common stock for the three and nine months ended September 30, 2020 and 2019 (in thousands, except share amounts and per share amounts):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Basic and diluted net income (loss) per share: |  |  |  |  |  |  |
Numerator |  |  |  |  |  |  |
Net income (loss) - continuing operations | $ | (16,561) |  |  | $ | (14,685) |  |  | $ | (300,533) |  |  | $ | (93,500) |
Less: Net income (loss) attributable to noncontrolling interests | (291) |  |  | 2,000 |  |  | 1,758 |  |  | 8,080 |
Net income (loss) attributable to common stockholders - continuing operations | (16,270) |  |  | (16,685) |  |  | (302,291) |  |  | (101,580) |
Net income (loss) attributable to common stockholders - discontinued operations | — |  |  | — |  |  | 382 |  |  | 2,162 |
Net income (loss) attributable to common stockholders | $ | (16,270) |  |  | $ | (16,685) |  |  | $ | (301,909) |  |  | $ | (99,418) |
Denominator |  |  |  |  |  |  |
Weighted-average common shares outstanding | 28,751,520 |  |  | 28,348,561 |  |  | 28,535,393 |  |  | 28,416,966 |
Basic and diluted net income (loss) per share: |  |  |  |  |  |  |
Continuing operations | $ | (0.57) |  |  | $ | (0.59) |  |  | $ | (10.59) |  |  | $ | (3.57) |
Discontinued operations | — |  | — |  |  | 0.01 |  | 0.08 |
Basic and diluted net income (loss) per share | $ | (0.57) |  |  | $ | (0.59) |  |  | $ | (10.58) |  |  | $ | (3.49) |
The following weighted-average potentially dilutive instruments are not included in the diluted net income (loss) per share calculations above because they would have had an antidilutive effect on the net income (loss) per share from continuing operations:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2020 |  | 2019 |  | 2020 |  | 2019
Restricted stock units | 1,907,396 |  |  | 1,768,908 |  |  | 1,879,752 |  |  | 1,657,446 |
Performance share units and other stock-based compensation awards | 151,110 |  |  | 78,055 |  |  | 199,849 |  |  | 81,545 |
Convertible senior notes | 2,314,815 |  |  | 2,314,815 |  |  | 2,314,815 |  |  | 2,314,815 |
Warrants | 2,314,815 |  |  | 2,314,815 |  |  | 2,314,815 |  |  | 2,314,815 |
Total | 6,688,136 |  |  | 6,476,593 |  |  | 6,709,231 |  |  | 6,368,621 |
We had outstanding performance share units as of September 30, 2020 and 2019 that were eligible to vest into shares of common stock subject to the achievement of specified performance or market conditions. Contingently issuable shares are excluded from the computation of diluted earnings per share if, based on current period results, the shares would not be issuable if the end of the reporting period were the end of the contingency period. As of September 30, 2020, there were up to 268,654 shares of common stock issuable upon vesting of outstanding performance share units that were excluded from the table above as the performance or market conditions were not satisfied as of the end of the period.

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