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401(k) Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan [Abstract] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 70.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match | 50.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Maximum per Employee | 6.00% |  |
Total expense related to 401(k) plan | $ 0.9 | $ 1.4 | $ 4.2

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- Definition Percentage employer matches of the employee's percentage contribution matched, maximum percentage per employee. + References No definition available. + Details
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Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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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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