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Employee Benefit Plans (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Employee Benefit Plans |  |  |  |
Employer match of first tier of employee contribution (as a percent) |  |  | 100 |
First tier percentage of compensation eligible for match |  |  | 3 |
Employer match of second tier of employee contribution (as a percent) |  |  | 50 |
Second tier percentage of compensation eligible for match |  |  | 4 |
Employer matching contributions | $ 1.0 | $ 0.6 | $ 2.6 | $ 1.5

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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 Percentage of employees' gross pay of first tier for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay of second tier for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of first tier of the employee's percentage contribution matched. + References No definition available. + Details
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