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Accrued product warranty liability (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Accrued product warranty liability [Roll Forward] |  |
Balance, beginning of period | $ 140 | $ 215
Warranties issued | 39 | 53
Warranty settlements | (70) | (107)
Balance, end of period | 109 | $ 161
Accrued product warranty liability, current | 88 |
Other Liabilities [Member] |  |
Accrued product warranty liability [Roll Forward] |  |
Accrued product warranty liability, non-current | $ 21 |
Maximum [Member] |  |
Warranty [Abstract] |  |
Product warranty period | 24 months |

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- Definition The extended warranty period on company products, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard 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=123368208&loc=d3e12565-110249 + Details
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X
- Definition Amount at end of the reporting period of the aggregate extended product warranty liability that is expected to be paid within one year of the balance sheet date or normal operating cycle, if longer. Does not include the balance for the standard product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount at end of the reporting period of the aggregate extended product warranty liability that is expected to be paid after one year from the balance sheet date or normal operating cycle, if longer. Does not include the balance for the standard product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of decrease in the extended product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the extended product warranty. Excludes standard 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)(2) -URI http://asc.fasb.org/extlink&oid=123368208&loc=d3e12565-110249 + Details
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- Definition Amount of increase in the extended product warranty accrual from warranties issued. Excludes standard 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=123368208&loc=d3e12565-110249 + 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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