SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty Reserve (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended |
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Mar. 31, 2021 |
Dec. 31, 2020 |
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| SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | ||
| Standard assurance warranty period | 1 year | 1 year |
| Internationally warranty period | 13 months | |
| Movement in Standard Product Warranty Accrual [Roll Forward] | ||
| Warranty reserve, at the beginning of the year | $ 1,553 | $ 1,491 |
| Warranty reserve, at the end of the period | $ 1,553 |
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- Definition The term of international warranty period. No definition available.
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- Definition Term of standard assurance warranty. No definition available.
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- References No definition available.
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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. No definition available.
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- Definition Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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