PREPAID EXPENSES AND OTHER ASSETS (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
ACCOUNTS RECEIVABLE (Details)
Prepaid consulting services	$ 0	$ 14,000
Prepaid clinical study	0	32,000
Prepaid insurance	302,000	347,000
PPE deposits	0	700,000
Prepaid equipment	67,000	61,000
Prepaid inventory	95,000	211,000
Prepaid expenses	31,000	66,000
Other assets	132,000	79,000
Prepaid expenses and other assets	627,000	1,510,000
Current portion of prepaid expenses and other assets	(544,000)	(1,452,000)
Prepaid expenses and other assets less current portion	$ 83,000	$ 58,000