SEGMENT AND GEOGRAPHIC DATA - Geographic Data Reporting (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 45,010	$ 25,413	$ 119,145	$ 74,117
Long-lived assets, net of accumulated depreciation and amortization	3,407	132	3,407	132
Net assets	36,530	32,058	36,530	32,058
Australia
Segment Reporting Information [Line Items]
Revenue	29,971	18,085	79,988	50,082
Long-lived assets, net of accumulated depreciation and amortization	25	26	25	26
Net assets	7,077	4,581	7,077	4,581
United States
Segment Reporting Information [Line Items]
Revenue	7,076	1,620	16,391	6,393
Long-lived assets, net of accumulated depreciation and amortization	3,310	27	3,310	27
Net assets	19,702	18,388	19,702	18,388
United Kingdon
Segment Reporting Information [Line Items]
Revenue	4,964	3,151	13,840	9,629
Long-lived assets, net of accumulated depreciation and amortization	33	32	33	32
Net assets	2,593	3,397	2,593	3,397
Other
Segment Reporting Information [Line Items]
Revenue	2,999	2,557	8,926	8,013
Long-lived assets, net of accumulated depreciation and amortization	39	47	39	47
Net assets	$ 7,158	$ 5,692	$ 7,158	$ 5,692