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Net Loss per Share (Tables) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2020 | Dec. 31, 2019
Earnings Per Share [Abstract] |  |
Schedule of Potentially Dilutive Securities Excluded from Computation of Diluted Net Loss Per Share | The following potentially dilutive securities have been excluded from the calculation of diluted net loss per share because including them would have had an anti-dilutive effect (in common stock equivalent shares):
|  | As of March 31, |
|  | 2020 |  |  | 2019 |
Options issued and outstanding |  |  | 2,302,435 |  |  |  | 1,706,317 |
Unvested restricted stock |  |  | — |  |  |  | 500 |
Unvested restricted stock units |  |  | 753,863 |  |  |  | 24,960 |
Total |  |  | 3,056,298 |  |  |  | 1,731,777 |
| The following potentially dilutive securities, prior to the use of the treasury stock method, have been excluded from the calculation of diluted net loss per share because including them would have had an anti-dilutive effect (in common stock equivalent shares):
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
Options issued and outstanding |  |  | 2,562,800 |  |  |  | 1,122,677 |
Unvested restricted stock |  |  | — |  |  |  | 1,000 |
Unvested restricted stock units |  |  | 828,935 |  |  |  | 24,960 |
Total |  |  | 3,391,735 |  |  |  | 1,148,637 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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