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Summary of Significant Accounting Policies and Other Items - Employee Benefit Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Accounting Policies [Abstract] |  |  |
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 | $ 1.2 | $ 1.6 | $ 3.1
Employer non-elective contribution | $ 0.0 | $ 0.0 | $ 0.1

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + 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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