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Description of Business and Summary of Significant Accounting Policies, Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
Impairment of Long-Lived Assets [Abstract] |  |  |
Impairment loss | $ 2,415 | $ 0 | $ 0

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- Definition Amount of loss from impairment of right-of-use asset from operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 25 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121593497&loc=SL77918431-209957 + Details
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