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Loss Per Common Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Loss Per Common Share | Loss Per Common Share Basic loss per common share is determined by dividing net loss by the weighted average number of common shares outstanding during the period. Diluted loss per share is determined by dividing loss attributable to common stockholders by the weighted average number of common shares outstanding, assuming all potentially dilutive shares were issued. We apply the treasury stock method to determine the dilutive weighted average common shares represented by the unvested restricted stock units and ESPP shares. The following table summarizes the basic and diluted loss per share calculations (in thousands, except per share amounts):
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Numerator |  |  |  |  |
Net loss | $ | (156,220) |  |  | $ | (235,329) |  |  | $ | (90,733) |
Denominator |  |  |  |  |
Basic and diluted weighted average common shares (1) | 226,042 |  |  | 225,159 |  |  | 223,999 |
Loss per common share: |  |  |  |  |
Basic and diluted | $ | (0.69) |  |  | $ | (1.05) |  |  | $ | (0.41) |
(1) | Approximate number of shares of unvested restricted stock units and stock to be issued pursuant to the ESPP that have been excluded from the computation of diluted loss per share as the effect would be anti-dilutive when the results from operations are at a net loss position. | 1,048 |  |  | 737 |  |  | 922 |

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