INCOME TAX - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss carry forward	$ 73,259	$ 55,514
Tax credit carryforwards	7,905	7,387
Share based compensation	3,281	4,903
Accrued expenses and other	1,226	2,325
Total gross deferred tax assets	85,671	70,129
Less - valuation allowance	(85,555)	(69,743)
Deferred tax liabilities:
Other	(40)	(41)
Right of use assets	(76)	(345)
Total gross deferred tax liabilities	(116)	(386)
Net deferred tax assets	$ 0	$ 0