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CONVERTIBLE NOTES AND CREDIT FACILITY - Carrying Amount of Debt (Details) - Convertible Debt - Senior Convertible Note - USD ($)	Mar. 31, 2022	Dec. 31, 2021	Sep. 17, 2019
Debt Instrument [Line Items]
Aggregate principal amount	$ 86,250,000	$ 86,250,000	$ 86,250,000
Unamortized debt discount	(2,110,000)	(2,216,000)
Net carrying amount	$ 84,140,000	$ 84,034,000

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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