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v3.20.4

Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Significant Accounting Policies |  |
Allowance for doubtful accounts receivable | $ 0.7 | $ 0.6
Maturity period of irrevocable letters of credit, minimum | 0 days |
Maturity period of irrevocable letters of credit, maximum | 90 days |

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Represents the maximum period over which irrevocable letters of credit mature. + References No definition available. + Details
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- Definition Represents the minimum period over which irrevocable letters of credit mature. + References No definition available. + Details
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