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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2020
Commitments and Contingencies |
Schedule of changes in product warranty reserves | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
​ | ​ | ​ | (in thousands)
Balance, beginning of the year | ​ | $ | 7,067 | ​ | $ | 7,852 | ​ | $ | 6,532
Warranties issued | ​ |  | 4,626 | ​ |  | 5,865 | ​ |  | 6,737
Consumption of reserves | ​ |  | (6,691) | ​ |  | (6,242) | ​ |  | (6,573)
Changes in estimate | ​ |  | 56 | ​ |  | (408) | ​ |  | 1,156
Balance, end of the year | ​ | $ | 5,058 | ​ | $ | 7,067 | ​ | $ | 7,852
Schedule of maturities of lease liabilities 2020 | ​
​ | ​ | ​ | ​
​ | ​ | Operating
​ |  | Leases
​ | ​ | (in thousands)
Payments due by period: | ​ | ​ | ​
2021 | ​ | $ | 4,671
2022 | ​ | ​ | 4,690
2023 | ​ | ​ | 1,306
2024 | ​ | ​ | 631
2025 | ​ | ​ | 66
Thereafter | ​ | ​ | —
Total future minimum lease payments | ​ | ​ | 11,364
Less: Imputed interest | ​ | ​ | (911)
Total | ​ | $ | 10,453
​ | ​ | ​ | ​
Reported as of December 31, 2020 | ​ | ​ | ​
Accrued expenses and other current liabilities | ​ | $ | 4,148
Operating lease long-term liabilities | ​ | ​ | 6,305
Total | ​ | $ | 10,453
Schedule of customers who accounted for more than 10% of our aggregate accounts receivable or net sales | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Accounts Receivable | ​ | Net Sales |
​ | ​ | December 31, | ​ | For the Year Ended December 31, |
Customer |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2018 |
Customer A | ​ | * | ​ | 16 | % | 13 | % | 11 | % | * | ​
Customer B | ​ | * | ​ | 21 | % | * | ​ | * | ​ | * | ​
Customer C | ​ | * | ​ | * | ​ | * | ​ | * | ​ | 12 | %
* | Less than 10% of aggregate accounts receivable or net sales
​

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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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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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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