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Net Loss Per Share Attributable to Common Shareholders (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Antidilutive Securities not Include in Computation of Net Loss per Share | The following common stock equivalents were excluded from the calculation of diluted net loss per share for the periods indicated because including them would have had an anti-dilutive effect (in thousands):
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Outstanding options |  |  | 8,572,663 |  |  |  | 8,495,315 |
Unvested restricted common shares |  |  | 1,052,379 |  |  |  | 967,060 |
ESPP |  |  | 10,594 |  |  |  | — |
Total |  |  | 9,635,636 |  |  |  | 9,462,375 |

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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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