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Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Securities not Included in Calculation of Diluted Net Loss Per Share (Details) - shares | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Shares Issuable upon Conversion of Series Seed Convertible |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities not included from calculation of diluted net loss per share |  | 4,444,444
Shares Issuable upon Conversion of Series A Convertible Preferred Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities not included from calculation of diluted net loss per share |  | 10,158,710
Shares Issuable upon Conversion of Series B Convertible Preferred Stock |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities not included from calculation of diluted net loss per share |  | 15,890,306
Shares Issuable upon Exercise of Stock Options |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities not included from calculation of diluted net loss per share | 8,099,861 | 2,104,311
Non-vested Shares under Restricted Stock Grants |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Potentially dilutive securities not included from calculation of diluted net loss per share | 5,053,169 | 7,799,605

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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