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Equity Awards and Instruments - Restricted Stock and Restricted Stock Units Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jul. 21, 2020 | Jul. 13, 2020 | Jul. 10, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Restricted stock expense |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 493,840 | 512,616
Vested (in shares) |  |  |  |  |  |  | 241,709 | 451,784
Shares withheld for tax withholding obligation (in shares) |  |  |  |  |  |  | 25,677 | 76,375
Restricted stock expense | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  |  |  |  |  | 4,798
Restricted stock expense | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  |  |  |  | 23,343 |
Restricted stock expense | 2020 Incentive Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 12,454 |  |  |  |
Performance Based Restricted Stock And Restricted Stock Units (RSUs) | 2020 Incentive Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value (USD per share) |  |  | $ 15.48 |  |  |  |  |
Vested (in shares) |  |  |  |  | 37,237 |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  |  | 998 |  |  |
Share-based compensation tax withholding payment |  |  |  |  | $ 15 |  |  |
Performance Based Restricted Stock And Restricted Stock Units (RSUs) | 2020 Incentive Award Plan | July 10, 2020 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 179,188 |  |  |  |  |
Performance Based Restricted Stock And Restricted Stock Units (RSUs) | 2020 Incentive Award Plan | July 10, 2020, Grant One |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 179,188 |  |  |  |  |
Performance Based Restricted Stock | 2020 Incentive Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) | 6,136 |  |  |  |  | 493,840 |  |
Grant date fair value (USD per share) | $ 15.48 |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  |  | 172,714 |  | 23,343
Shares withheld for tax withholding obligation (in shares) |  |  |  |  | 8,774 | 18,763 |  |
Share-based compensation tax withholding payment |  |  |  |  | $ 95 | $ 136 |  | $ 170
Shares canceled (in shares) |  |  |  |  |  | 292,131 |  | 60,832
Performance Based Restricted Stock | Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares withheld for tax withholding obligation (in shares) |  |  |  |  | 3,168 |  |  |
Share-based compensation tax withholding payment |  |  |  |  |  | $ 25 |  |
Shares outstanding (in shares) |  |  |  |  | 31,015 |  | 54,770 |
Performance Based Restricted Stock | Equity Incentive Plan | Colleagues |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vested (in shares) |  |  |  |  | 26,760 | 11,348 |  |
Restricted Stock and Restricted Stock Units (RSUs) | 2020 Incentive Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) | 1,020,472 | 10,000 |  |  |  |  |  |
Restricted Stock and Restricted Stock Units (RSUs) | 2020 Incentive Award Plan | July 10, 2020, Grant Two |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 994,912 |  |  |  |  |
Restricted Stock and Restricted Stock Units (RSUs) | Equity Incentive Plan | July 10, 2020 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | 10,742 |  |  |
Restricted Stock and Restricted Stock Units (RSUs) | Equity Incentive Plan | July 21, 2020 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Forfeited (in shares) |  |  |  |  | 12,500 |  |  |
Cash-Settled Restricted Stock Units (RSUs) | 2020 Incentive Award Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Granted (in shares) | 46,300 |  | 32,238 |  |  |  |  |
Grant date fair value (USD per share) | $ 15.48 |  |  |  |  |  |  |
Cash-Settled Restricted Stock Units (RSUs) | Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Grant date fair value (USD per share) |  |  | $ 15.48 |  |  |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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