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Retirement Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
UNITED STATES |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Contribution amount | $ 397 | $ 488 | $ 425
CANADA |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Matching contributions | 100.00% |  |
Contribution amount | $ 18 | $ 59 | $ 25
Maximum | UNITED STATES |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Matching contributions | 100.00% |  |
Employer matching contribution, percent of employees' gross pay | 3.00% |  |
Maximum | CANADA |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of employees' gross pay | 5.00% |  |
Minimum | UNITED STATES |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Matching contributions | 50.00% |  |
Employer matching contribution, percent of employees' gross pay | 2.00% |  |
Minimum | CANADA |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Employer matching contribution, percent of employees' gross pay | 3.00% |  |

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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 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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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Details
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