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Valuation and qualifying accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts |  |  |
Valuation and qualifying accounts |  |  |
Balance at the beginning of the year | $ 1,487 | $ 871 | $ 1,056
Additions charged to earnings | 1,081 | 1,361 | 531
Changes to net | 361 | (745) | (716)
Balance at the end of the year | 2,929 | 1,487 | 871
Valuation of deferred tax assets |  |  |
Valuation and qualifying accounts |  |  |
Balance at the beginning of the year | 1,612 | 1,473 | 777
Changes to net | 1,762 | 139 | 696
Balance at the end of the year | $ 3,374 | $ 1,612 | $ 1,473

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- Definition Total of the deductions, net of recoveries, of amounts that had previously been written off as uncollectible, in a given period to allowances and reserves, the valuation and qualifying accounts that are netted against the cost of an asset (in order to value it at its carrying value). + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Details
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- Details
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