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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2019
Accounting Policies [Abstract] |
Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Net Loss Per Share | The table below provides potentially dilutive securities not included in the calculation of the diluted net loss per share because to do so would be anti-dilutive:
| As of September 30, |
| 2019 |  | 2018 |
Shares issuable upon conversion of Series Seed Convertible Preferred Stock |  | — |  |  | 4,444,444 |
Shares issuable upon conversion of Series A Convertible Preferred Stock |  | — |  |  | 10,158,710 |
Shares issuable upon conversion of Series B Convertible Preferred Stock |  | — |  |  | 15,890,306 |
Shares issuable upon exercise of stock options |  | 8,099,861 |  |  | 2,104,311 |
Non-vested shares under restricted stock grants |  | 5,053,169 |  |  | 7,799,605 |

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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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