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Employee 401(k) Plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Employee 401(k) Plan |  |  |
Maximum percentage of pretax salary, which can be deferred by employees | 20.00% |  |
Maximum amount of wages, which can be deferred by employees | $ 18,000 |  |
Maximum amount of wages, which can be deferred by employees at least 50 years of age | $ 24,000 |  |
Minimum age of employees for a specified contribution amount of wages | 50 years |  |
Percentage of employee's salary for which the company contributes a matching contribution | 50.00% |  |
Maximum percentage of employee's salary for which the company contributes a matching contribution | 8.00% |  |
Amount of employer contribution | $ 400,000 | $ 400,000 | $ 300,000

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- Definition The amount of the cost recognized during the period for defined contribution plans. + 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 Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Definition Represents the maximum amount of wages, which can be deferred by participants with a specified age, for defined contribution plans. + References No definition available. + Details
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