LEASES - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) ft² term	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Monthly rent	$ 21,400
Rent expense	$ 66,000	$ 76,000
Minimum
Lessee, Lease, Description [Line Items]
Lease term	4 months
Maximum
Lessee, Lease, Description [Line Items]
Lease term	6 months
Canada
Lessee, Lease, Description [Line Items]
Office space, square foot | ft²	31,100
Lease term	5 years
Renewal option | term	1
Renewal term	5 years
Monthly rent	$ 12,800
Related operating expenses (per month)	12,500
Operating lease cost (including related operating costs)	$ 76,000	$ 75,000