ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Other long-term liabilities	$ 5,049	$ 7,245
Uncertain income tax positions recorded in noncurrent liabilities	200	200
Accrued lease restoration costs	300	300
Severance Costs	500
Accrued benefit liability	213	370
Operating Lease, Liability, Noncurrent	4,300	6,100
Foreign Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accrued benefit liability	$ 200	$ 400