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Net Loss Per Share - Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - $ / shares | 6 Months Ended |
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Jun. 30, 2020 | Jun. 30, 2019 | Aug. 31, 2019
Class A Common Stock |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 4,300,000 |  |
Shares subject to outstanding common stock options |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 3,639,228 | 4,957,839 |
Shares subject to unvested restricted stock awards |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 3,006,717 | 2,780,345 |
Shares issuable pursuant to the ESPP |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 103,231 | 89,311 |
Convertible debt | 1.125% Convertible Senior Notes Due 2026 |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Conversion price (in dollars per share) |  |  | $ 80.16

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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://www.xbrl.org/2003/role/disclosureRef -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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