ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Company Organization (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) region	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of regions in which company sells products | region	3
Liability for Uncertainty in Income Taxes, Noncurrent		$ 200
Deposits for building leases	$ 1,300	1,300
Severance Costs	800	600
Realized Gain (Loss), Foreign Currency Transaction, before Tax	200	200
Cash and cash equivalents	7,731	13,777	$ 24,185
Restricted Cash and Cash Equivalents	1,700	1,400
Allowance for doubtful accounts	1,300	1,000
Other Prepaid Expense, Current	1,100	1,200
Other long-term liabilities	3,986	5,026
Accounts receivable, net of allowance of $1,278 and $973 in 2023 and 2022, respectively	91	218	100
Accounts receivable, allowance for doubtful accounts	1,278	973	$ 987
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	519	(26)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ (214)	$ 12