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Employee Benefit Plans and Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | May 28, 2015
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 | 800,000 |  |
Options in-the-money | 28,385 |  |  |
In-the-money options, maximum exercise price (USD per share) | $ 218.74 |  |  |
Unrecognized compensation costs related to unvested restricted stock units | $ 119.3 |  |  |
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) | 4.00% |  |  |
Total matching contributions | $ 4.8 | $ 2.6 |  |
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) | 150,408 | 189,904 | 122,857 |
Weighted-average remaining contractual term of stock options | 3 months 7 days |  |  |
Weighted-average exercise price of stock options (USD per share) | $ 10.11 |  |  |
Aggregate intrinsic value of stock options | $ 5.9 |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of RSUs vested | $ 207.2 | $ 120.9 | $ 144.5 |
Minimum | Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Maximum | Restricted Stock |  |  |  |
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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + 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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