FAIR VALUE MEASUREMENT - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial assets:
Stanley Brothers USA Holdings purchase option	$ 13,100	$ 13,000
Financial liabilities:
Warrant liabilities	0	0
Level 1
Financial assets:
Stanley Brothers USA Holdings purchase option	0	0
Financial liabilities:
Warrant liabilities	0	0
Level 2
Financial assets:
Stanley Brothers USA Holdings purchase option	0	0
Financial liabilities:
Warrant liabilities	0	0
Level 3
Financial assets:
Stanley Brothers USA Holdings purchase option	13,100	13,000
Financial liabilities:
Warrant liabilities	$ 0	$ 0