REVENUE - Schedule of Revenue by (Details) - USD ($) $ in Thousands	3 Months Ended					6 Months Ended		12 Months Ended
	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 51,091	$ 49,017	$ 42,760	$ 38,285	$ 36,877	$ 96,871	$ 75,162	$ 166,939
Subscription and transaction fees
Disaggregation of Revenue [Line Items]
Revenue	41,188	38,234	34,686	33,214	33,108	81,812	66,322	139,242
Transaction fees
Disaggregation of Revenue [Line Items]
Revenue	26,775	24,365	21,002	20,454	19,677	53,195	40,131	85,498
Subscription fees
Disaggregation of Revenue [Line Items]
Revenue	14,413	13,869	13,684	12,760	13,431	28,617	26,191	53,744
Equipment sales
Disaggregation of Revenue [Line Items]
Revenue	$ 9,903	$ 10,783	$ 8,074	$ 5,071	$ 3,769	$ 15,059	$ 8,840	$ 27,697