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Leases (Narrative) (Details) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) Location | Mar. 31, 2020 USD ($) | Jan. 01, 2019
Leases [Abstract] |  |  |
Number of locations | Location | 3 |  |
Lessee operating lease, incremental borrowing rate |  |  | 5.25%
Lease expense | $ | $ 0.1 | $ 0.1 |

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- Definition Lessee operating lease, incremental borrowing rate. + References No definition available. + Details
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- Definition Number of locations. + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 + Details
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