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Stockholders' Equity - Additional Information (Details) shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) Plan shares | Mar. 31, 2018 USD ($) | Dec. 31, 2018 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of share-based employee compensation plans | Plan | 3 |  |
Pre-2017 RSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 140.0 |  |
Weighted average recognition period | 1 year 6 months |  |
Post-2017 RSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 1,400.0 |  |
Weighted average recognition period | 3 years 1 month 6 days |  |
Service condition satisfied, years | 4 years |  |
Post-2017 RSUs | First Year |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting percentage | 10.00% |  |
Post-2017 RSUs | Second Year |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting percentage | 20.00% |  |
Post-2017 RSUs | Third Year |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting percentage | 30.00% |  |
Post-2017 RSUs | Fourth Year |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting percentage | 40.00% |  |
RSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
RSUs vested but not yet settled | shares | 20.8 |  | 22.4
RSAs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation cost | $ 48.4 |  |
Weighted average recognition period | 3 years 3 months 18 days |  |
Fair value of vested shares | $ 4.6 | $ 1.6 |
Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Weighted average recognition period | 2 years 3 months 18 days |  |
Unrecognized compensation cost related to stock options granted and assumed | $ 32.3 |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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