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v3.21.1

Sales, Contract Assets and Contract Liabilities (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Sales, Contract Assets and Contract Liabilities |  |  |  |  |  |  |  |  |  |
Revenue | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0 | $ 0
Cost of goods sold before warranty adjustment |  |  |  |  |  |  |  |  | 450,000 |
Cost of goods sold - warranty adjustment |  |  |  |  |  |  |  |  | 171,000 | 1,000
Contract assets | 92,000 |  |  |  | 39,000 |  |  |  | 92,000 | 39,000
Contract liabilities | $ 94,000 |  |  |  | $ 50,000 |  |  |  | $ 94,000 | $ 50,000

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period before warranty adjustments. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + References No definition available. + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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