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Product Warranty (Tables) | 3 Months Ended
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Mar. 31, 2021
Product Warranty |
Schedule of product warranty liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​
​ | ​ | March 31, | ​
​ |  | 2021 |  | 2020 |
​ | ​ | (in thousands) | ​
Balance at January 1 (beginning of year) | ​ | $ | 4,612 | ​ | $ | 3,244 | ​
Warranties issued during the period | ​ |  | 1,288 | ​ |  | 1,385 | ​
Settlements made during the period | ​ |  | (968) | ​ |  | (950) | ​
Changes in estimate of liability for pre-existing warranties during the period | ​ |  | (192) | ​ |  | 126 | ​
Balance at March 31 (end of period) | ​ | $ | 4,740 | ​ | $ | 3,805 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amount classified as current | ​ | $ | 4,181 | ​ | $ | 3,431 | ​
Amount classified as long-term | ​ |  | 559 | ​ |  | 374 | ​
Total warranty liability | ​ | $ | 4,740 | ​ | $ | 3,805 | ​

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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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