Basis of Presentation and Summary of Significant Accounting Policies - Operating expenses (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Operating Expenses [Line Items] | |||
| Advertising costs | $ 0.1 | $ 0.0 | |
| Recoveries from business interruption insurance | $ 0.9 | $ 0.0 | $ 0.0 |
| Maximum | |||
| Operating Expenses [Line Items] | |||
| Advertising costs | $ 0.1 | ||
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Details
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