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Net Loss Per Share (Tables) | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Schedule of Potentially Dilutive Shares | The following outstanding potentially dilutive shares have been excluded from the calculation of diluted net loss per share for the period presented due to their anti-dilutive effect:
| March 31, |  |
| 2020 |  | 2019
Stock options to purchase common stock | 11,627,389 |  |  | 8,939,556 |
Restricted stock units subject to vesting | 2,534,671 |  |  | 1,102,028 |
Expected shares to be purchased under Employee Stock Purchase Plan | 226,459 |  |  | 265,455 |
Founder's shares of common stock subject to future vesting | 12,115,382 |  |  | 18,173,066 |
Early exercised stock options subject to future vesting | 2,678,501 |  |  | 5,020,580 |
Total | 29,182,402 |  |  | 33,500,685 |

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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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