v3.20.4

Summary of Business and Significant Accounting Principles - Warranty Accrual (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward] |  |
Balance, beginning of year | $ 6,001,864 | $ 7,058,769
Accrual for warranty (1) | 2,115,762 | 92,191
Warranty costs incurred | (2,717,626) | (1,149,096)
Balance, end of year | $ 5,400,000 | $ 6,001,864

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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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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the standard product warranty accrual from warranties issued. Excludes extended product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Standard Product Warranty Accrual, Costs Incurred + References No definition available. + Details
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Namespace Prefix: | wkhs_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration