ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other assets	$ 11,977	$ 9,592
Deposits for building leases		2,200
Deposit assets	2,600	1,600
Indefinite lived intangible assets	200		$ 200
Operating Lease, Right-of-Use Asset	6,900	5,600
Prepaid Inventory	$ 800	$ 700