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Net Loss Per Share | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Net Loss Per Share | 10. Net Loss Per Share Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares outstanding during the period and giving effect to all potentially dilutive common shares using the treasury-stock method. For purposes of this calculation, outstanding stock options, stock awards, warrants and Series B Convertible Preferred Stock are considered to be potentially dilutive common shares and are only included in the calculation of diluted net loss per share when their effect is dilutive. The following were excluded from the calculation of diluted net loss per share as the effect of their inclusion would have been anti-dilutive.
| Three Months Ended |  |  | Six Months Ended |
| June 30, |  |  | June 30, |
| 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Outstanding securities not included in diluted net loss per share calculation (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options and stock awards |  | 11,276 |  |  |  | 10,950 |  |  |  | 11,276 |  |  |  | 10,950 |
Series B Convertible Preferred Stock (as converted to common stock) |  | 4,140 |  |  |  | - |  |  |  | 4,140 |  |  |  | - |
Warrants (as exercisable into common stock) |  | 5,841 |  |  |  | - |  |  |  | 5,841 |  |  |  | - |
|  | 21,257 |  |  |  | 10,950 |  |  |  | 21,257 |  |  |  | 10,950 |

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