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Equity Plans - Performance Stock Units (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Equity Plans |  |  |  |
Stock-based compensation |  |  | $ 11,371,000 | $ 5,932,000
Performance Stock Units |  |  |  |
Equity Plans |  |  |  |
Number of shares, Granted |  | 110,500 | 110,500 |
Grant date fair value, price per share |  | $ 23.57 |  |
Vesting percentage of requisite service period |  | 100.00% |  |
Expiration period |  | 5 years |  |
Fair value of stock units | $ 2,600,000 |  |  |
Stock-based compensation |  |  | $ 0 |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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