GEOGRAPHICAL INFORMATION - Revenue from External Customers by Geographic Areas (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2022	Mar. 31, 2021
Revenue, Major Customer
Revenues	$ 51,438	$ 45,433	$ 43,238	$ 36,968	$ 46,728	$ 55,819	$ 35,604	$ 36,970	$ 177,077	$ 175,121
United States
Revenue, Major Customer
Revenues									142,898	147,010
Foreign
Revenue, Major Customer
Revenues									$ 34,179	$ 28,111