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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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