LEASES - Narrative (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) ft² term	Mar. 31, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Monthly rent	$ 20,000
Rent expense	$ 69,000	$ 66,000
Canada
Lessee, Lease, Description [Line Items]
Office space (in square feet) | ft²	31,100
Lease term	2 years
Renewal option | term	1
Renewal term	3 years
Monthly rent	$ 13,500
Related operating expenses, per month	12,300
Operating lease cost, including related operating cost	$ 82,000	$ 76,000