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Employee Benefit Plans and Stockholders' Equity - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock authorized in ESPP (shares) | 1,500,000 |  |  |
Maximum payroll deductions (as a percent) | 10.00% |  |  |
Employee purchase price floor (as a percent) | 85.00% |  |  |
Stock reserved for issuance (shares) |  |  |  | 9,800,000
Purchases of treasury stock (shares) | 0 | 0 | 800,000 |
Options in-the-money (shares) | 0 |  |  |
Unrecognized compensation costs related to unvested restricted stock units | $ 147.6 |  |  |
401(k) Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum employee contribution (as a percent) | 75.00% |  |  |
Employer matching contribution (as a percent) | 50.00% |  |  |
Employee contribution (as a percent) | 5.00% |  |  |
Total matching contributions | $ 6.7 | $ 4.8 |  |
Employee Stock Purchase Plan 2015 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan (shares) | 89,194 | 150,408 | 189,904 |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of RSUs vested | $ 331.8 | $ 207.2 | $ 120.9 |
Restricted Stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Restricted Stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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