REVENUE RECOGNITION - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended	11 Months Ended	12 Months Ended		18 Months Ended
	Jun. 20, 2017	May 31, 2020	Jun. 05, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Related Party Transaction [Line Items]
Prepayments received					$ 11,050
Affiliated Entity | Shenghe
Related Party Transaction [Line Items]
Deferred revenue percentage recognized from gross profit	64.00%
Tariff rebates		$ 1,400
Affiliated Entity | Shenghe | Offtake Advances
Related Party Transaction [Line Items]
Reduction in principal debt balance due to tariff rebate				$ 2,000	$ 9,300
Affiliated Entity | Shenghe | Shenghe Implied Discount
Related Party Transaction [Line Items]
Shenghe Implied Discount, percentage of contractual gross profit	36.00%					36.00%
Affiliated Entity | Shenghe | Minimum | Shenge Sales Discount
Related Party Transaction [Line Items]
Related parties, sales discount			3.00%
Affiliated Entity | Shenghe | Maximum | Shenge Sales Discount
Related Party Transaction [Line Items]
Related parties, sales discount			6.00%