INCOME TAXES - TEMPORARY DIFFERENCES TO THE COMPONENTS OF DEFERRED TAX ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Inventory	$ 4,616	$ 2,993
Deferred Tax Liabilities, Deferred Expense, Compensation And Benefits, Employee Compensation	(70)
Accrued compensation		295
Stock and Stock Options	3,581	2,322
Research and development tax credit	1,276	1,308
Research and development expense	3,291	2,571
Deferred revenue	1,390	1,441
Property and equipment	524	298
Net operating loss carryforwards – domestic	4,401	8,757
Foreign tax credit carryforward	64	64
Sales-type leases	2,494
Sales-type leases		1,324
Convertible debt equity component	0	(8,691)
Foreign intangible	(11,477)	(11,311)
Other	(540)	(1,124)
Deferred tax assets, gross	9,550	247
Valuation allowance	2,788	6,409
Total net deferred tax assets (liabilities)		$ 6,162
Total net deferred tax assets (liabilities)	$ 6,762