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v3.22.1

Employee retirement plan (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Retirement Benefits [Abstract] |  |  |
Employer matching contribution, percent of match | 25.00% |  |
Employer matching contribution, percent of employees' gross pay | 6.00% |  |
Maximum annual contributions per employee | $ 500 |  |
Vesting period (in years) | 2 years |  |
Annual vesting percentage | 50.00% |  |
Vesting percentage after two years of employment | 1 |  |
Contributions made | $ 400,000 | $ 200,000 | $ 200,000

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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 employer's matching contributions to a defined contribution plan that vests in a given year. + References No definition available. + 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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