LONG-TERM DEBT (Details)	1 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2021 USD ($) employee agreement	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Nov. 30, 2017 USD ($)
Long-term debt
Timeframe when amount will be repaid through property taxes			2 years
Construction Loan Agreement
Long-term debt
Face amount		$ 25,600,000
Amortization period		20 years
Initial investment						$ 16,400,000
Amount drawn from loan			$ 22,800,000	$ 23,800,000
Interest incurred, accrued for as an interest reserve			700,000	$ 700,000
Interest costs capitalized	$ 700,000
Debt issuance costs, net						200,000
Minimum liquidity covenant for construction loan					$ 250,000,000
Construction Loan Agreement | 1-month LIBOR
Long-term debt
Variable rate		2.25%
Tax Increment Financing
Long-term debt
Face amount	$ 4,600,000		$ 4,600,000
Number of agreements | agreement			2
Number of jobs required to create and maintain | employee			500
Term			5 years
City Letter of Credit
Long-term debt
Interest-only payment, period		24 months
City Letter of Credit | Construction Loan Agreement
Long-term debt
Maximum borrowing capacity						$ 600,000