GEOGRAPHICAL INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 144,719	$ 136,685	$ 129,133	$ 121,807	$ 121,478	$ 118,567	$ 109,517	$ 96,675	$ 532,344	$ 446,237	$ 352,586
Property and equipment, net	93,076				94,382				93,076	94,382
United States
Segment Reporting Information [Line Items]
Revenue									390,758	350,368	304,378
Property and equipment, net	87,945				87,673				87,945	87,673
International
Segment Reporting Information [Line Items]
Revenue									141,586	95,869	$ 48,208
Property and equipment, net	$ 5,131				$ 6,709				$ 5,131	$ 6,709