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Description of Business and Summary of Significant Accounting Policies, Interest (Income) Expense, net (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Interest (Income) Expense, net [Abstract] |  |  |
Interest expense | $ 391 | $ 152 | $ 2,451

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- Definition Interest and debt related expenses associated with nonoperating financing activities of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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