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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Product Warranty Liability [Table Text Block] | Changes in the liability for product warranty and deferred revenue associated with extended warranties and service contracts were as follows (in thousands):
| Product Warranty |  | Deferred Revenue
Liability at January 1, 2019 | $ | 22 |  |  | $ | 1,471 |
Settlements made during the period | — |  |  | (1,087) |
Change in liability for warranties issued during the period | — |  |  | 725 |
Change in liability for pre-existing warranties | (22) |  |  | — |
Liability at December 31, 2019 | — |  |  | 1,109 |
Settlements made during the period | — |  |  | (817) |
Change in liability for warranties issued during the period | — |  |  | 447 |
Change in liability for pre-existing warranties | — |  |  | — |
Liability at December 31, 2020 | $ | — |  |  | $ | 739 |
Current liability | $ | — |  |  | $ | 438 |
Non-current liability | — |  |  | 301 |
Liability at December 31, 2020 | $ | — |  |  | $ | 739 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate 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 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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