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Net Loss Per Share (Details) - shares | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive shares excluded from calculation of diluted net loss per share (in shares) | 29,182,402 | 33,500,685
Stock options to purchase common stock |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive shares excluded from calculation of diluted net loss per share (in shares) | 11,627,389 | 8,939,556
Restricted stock units subject to vesting |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive shares excluded from calculation of diluted net loss per share (in shares) | 2,534,671 | 1,102,028
Expected shares to be purchased under Employee Stock Purchase Plan |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive shares excluded from calculation of diluted net loss per share (in shares) | 226,459 | 265,455
Founder's shares of common stock subject to future vesting |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive shares excluded from calculation of diluted net loss per share (in shares) | 12,115,382 | 18,173,066
Early exercised stock options subject to future vesting |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |
Antidilutive shares excluded from calculation of diluted net loss per share (in shares) | 2,678,501 | 5,020,580

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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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