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v3.8.0.1

Employee Benefit Plan (Details) | 12 Months Ended
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Dec. 31, 2017
Employee Benefit Plan |
Maximum percentage of compensation that the employees may contribute to the 401 (k) plan | 60.00%
Employer matching contribution (as a percent) | 50.00%
Employer's matching contribution as a percentage of employee's compensation, maximum | 6.00%

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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