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Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Millions |  | 9 Months Ended
--- | --- | ---
Mar. 01, 2021 $ / shares shares | Sep. 30, 2021 USD ($) Metric shares | Sep. 30, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Grant date fair value (in dollars per share) | $ / shares | $ 0.79 |  |
Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Expected volatility rate |  | 43.28% |
Expected term |  | 5 years |
Risk free interest rate |  | 0.24% |
Expected dividend yield |  | 13.30% |
Options granted (in shares) | 478,000 |  |
Share based compensation expense | $ |  | $ 0.6 | $ 0.8
Unrecognized compensation costs related to awards | $ |  | $ 1.0 |
Expected weighted average period to recognize expense |  | 2 years 2 months 12 days |
Restricted Stock Award |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Expected volatility rate |  | 48.20% |
Risk free interest rate |  | 0.22% |
Share based compensation expense | $ |  | $ 15.2 | $ 18.3
Unrecognized compensation costs related to awards | $ |  | $ 19.3 |
Expected weighted average period to recognize expense |  | 2 years 2 months 12 days |
Granted (in shares) |  | 1,551,000 |
Performance measurement | Metric |  | 2 |
Beta |  | 0.79 |
Restricted Stock Award | Tranche One |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) |  | 50.00% |
Performance period |  | 3 years |
Restricted Stock Award | Tranche Two |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) |  | 50.00% |
Performance period |  | 3 years |
Restricted Stock Award | Tranche Three |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Performance period |  | 1 year |
Restricted Stock Award | Certain Employees and Executive Officers |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted (in shares) |  | 1,551,000 |
Restricted Stock Award | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period (in years) |  | 3 years |
Award vesting rights (as percent) |  | 0.00% |
Restricted Stock Award | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Vesting period (in years) |  | 4 years |
Award vesting rights (as percent) |  | 200.00% |
Performance Shares | Certain Employees and Executive Officers |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted (in shares) |  | 919,000 |
Employee Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Discount on purchase of Common Stock for employee from the current market price |  | 5.00% |
Capital shares reserved for future issuance |  | 506,023 |
Issuance of common stock (ESPP) (in shares) |  | 35,314 |
2018 Stock Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Additional shares authorized |  | 16,800,000 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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