INCOME TAXES - Tax Carryforwards (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Domestic
Operating Loss Carryforwards [Line Items]
Net operating loss	$ 388
Domestic | Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credits	12,809
Domestic | Research and Devolopment
Operating Loss Carryforwards [Line Items]
Tax credits	4,467
Domestic | Research and Devolopment | Texas
Operating Loss Carryforwards [Line Items]
Tax credits	3,700
Domestic | Research and Devolopment | LOUISIANA
Operating Loss Carryforwards [Line Items]
Tax credits	239
Domestic | Foreign Tax Credit
Operating Loss Carryforwards [Line Items]
Tax credits	64
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss	414
Foreign | Capital Loss Carryforward
Operating Loss Carryforwards [Line Items]
Tax credits	$ 4