INCOME TAXES - Operating Loss Carryforwards and Research Tax Credits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Research tax credits	$ 18,661	$ 18,076
Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	498,607	477,839
Research tax credits	13,569	12,985
Foreign
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards	0	0
Texas
Operating Loss Carryforwards [Line Items]
Research tax credits	$ 5,091	$ 5,091