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Employee Benefits - 401(k) and profit sharing plan (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
401(k) plan |  |  |
Schedule of Defined Contribution Plans Disclosures [Line Items] |  |  |
Requisite service period | 1 month |  |
Employer contribution amount | $ 1,008 | $ 959 | $ 748
Profit sharing plan |  |  |
Schedule of Defined Contribution Plans Disclosures [Line Items] |  |  |
Requisite service period | 2 years |  |
Percentage vesting annually | 100.00% |  |
Employer contribution amount | $ 370 | $ 750 | $ 900
Minimum | 401(k) plan |  |  |
Schedule of Defined Contribution Plans Disclosures [Line Items] |  |  |
Employer matching of employee contributions, percentage | 50.00% |  |
Employer matching contribution, percentage of compensation | 3.00% |  |
Maximum | 401(k) plan |  |  |
Schedule of Defined Contribution Plans Disclosures [Line Items] |  |  |
Employer matching of employee contributions, percentage |  | 100.00% |
Employer matching contribution, percentage of compensation | 5.00% |  |

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- Definition Defined Contribution Plan Requisite Service Period + References No definition available. + Details
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- Definition [Line Items] for Schedule of Defined Contribution Plans Disclosures [Table] + References No definition available. + 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 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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- 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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- Details
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- Details
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- Details
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- Details
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