LEASES - Narrative (Details)		12 Months Ended
	Jan. 01, 2019 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Right-of-use assets	$ 750,000	$ 335,000	$ 519,000
Lease liabilities	$ 750,000	317,000
Accumulated deficit		(71,564,000)	(60,939,000)
Operating leases		200,000	200,000
Right-of-use assets obtained in exchange for operating lease obligations		0	750,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		$ 29,000	0
Minimum
Lessee, Lease, Description [Line Items]
Facility leases | item	1
Renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Current prepaid expense			$ 100,000
Renewal term	5 years
ASU 2016-02
Lessee, Lease, Description [Line Items]
Increase (decrease) in deferred rent and prepaid expenses	$ (6,000)
Current prepaid expense	6,000
Accumulated deficit	$ 0