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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Concentration Risk [Line Items] |  |  |  |
Property, plant, and equipment, net | $ 42,591,000 | $ 42,591,000 | $ 55,510,000 |
Goodwill impairment | 0 | 0 | 222,322,000 | $ 0
Advertising expense |  | 39,800,000 | 48,400,000 | 58,400,000
Research and development expense |  | 11,500,000 | 10,800,000 | 18,800,000
Unrecognized tax benefits, income tax penalties and interest expense |  | 0 | 0 | 0
Net foreign exchange gain (loss) |  | (100,000) | (3,200,000) | $ (1,400,000)
Operating lease right-of-use assets | 48,188,000 | 48,188,000 | $ 13,854,000 |
Operating lease, liability | $ 32,750,000 | $ 32,750,000 |  |
Residential Model Pellet Grills |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Standard product warranty |  | 3 years |  |
Accessories For Defects In Material And Workmanship |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Standard product warranty |  | 1 year |  |
Software and Software Development Costs |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Estimated useful lives (in years) | 3 years | 3 years |  |
Minimum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Lessee, operating lease, remaining lease term | 1 month | 1 month |  |
Finite-lived intangibles, weighted average useful life (in years) | 2 years 6 months | 2 years 6 months |  |
Maximum |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Lessee, operating lease, remaining lease term | 14 years | 14 years |  |
Finite-lived intangibles, weighted average useful life (in years) | 25 years | 25 years |  |
Customer Concentration Risk | Customer A | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 37.00% | 31.00% |
Customer Concentration Risk | Customer B | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 11.00% | 20.00% |
Customer Concentration Risk | Customer C | Accounts Receivable |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage |  | 6.00% | 8.00% |

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