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Stock-Based Compensation - Shares Purchased and Compensation Expenses for ESPP (Details) - 2012 Purchase Plan - USD ($) shares in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2021 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation [Line Items] |  |  |  |
Shares purchased under the plans | 0.1 | 0.2 | 0.3 | 0.2
Plan compensation expense | $ 0.6 | $ 1.5 | $ 1.7 | $ 1.0

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- Definition Number of shares purchased for issuance under share-based payment arrangement. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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- Definition Amount of cost expensed and capitalized for award under share-based payment arrangement. + 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 (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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