SEGMENT AND GEOGRAPHIC DATA - Geographic Data Reporting (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenue	$ 34,461	$ 24,131
Long-lived assets, net of accumulated depreciation and amortization	3,533	164
Net assets	34,151	32,630
Australia
Segment Reporting Information [Line Items]
Revenue	23,474	15,031
Long-lived assets, net of accumulated depreciation and amortization	29	30
Net assets	6,106	3,308
United States
Segment Reporting Information [Line Items]
Revenue	4,248	2,873
Long-lived assets, net of accumulated depreciation and amortization	3,436	39
Net assets	18,612	21,185
United Kingdon
Segment Reporting Information [Line Items]
Revenue	3,871	3,452
Long-lived assets, net of accumulated depreciation and amortization	34	35
Net assets	2,684	2,159
Other
Segment Reporting Information [Line Items]
Revenue	2,868	2,775
Long-lived assets, net of accumulated depreciation and amortization	34	60
Net assets	$ 6,749	$ 5,978