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Stock-Based Compensation - Additional Information (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Total unamortized compensation costs, net of estimated forfeitures related to unvested stock options | $ 13.2
Unamortized compensation costs related to unvested stock options, expected period of recognition | 2 years 2 months 12 days
Restricted Stock Units ("RSUs") |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Unamortized compensation costs related to unvested stock options, expected period of recognition | 2 years 7 months 6 days
Total unamortized compensation costs, net of estimated forfeitures related to restricted stock unit | $ 39.5
Performance Based Restricted Stock Units ("PRSU") |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Performance period | 2 years
Number of share unit granted | shares | 202,738
Performance Based Restricted Stock Units ("PRSU") | Minimum |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Performance threshold | 75.00%
Performance target to be earned at performance threshold | 50.00%
Fair value of shares granted | $ 0.0
Performance Based Restricted Stock Units ("PRSU") | Maximum |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Performance threshold | 125.00%
Performance target to be earned at performance threshold | 200.00%
Fair value of shares granted | $ 19.5
ESPP |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Total unamortized compensation costs, net of estimated forfeitures related to unvested stock options | $ 0.9
Unamortized compensation costs related to unvested stock options, expected period of recognition | 8 months 12 days

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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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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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