STOCK INCENTIVE PLANS - Stock-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share-based Payment Arrangement, Expense
Stock based compensation expense	$ 14,667	$ 710
Cost of revenue, net
Share-based Payment Arrangement, Expense
Stock based compensation expense	4,908	188
Research and development
Share-based Payment Arrangement, Expense
Stock based compensation expense	2,708	154
General and administrative
Share-based Payment Arrangement, Expense
Stock based compensation expense	4,975	304
Sales and marketing
Share-based Payment Arrangement, Expense
Stock based compensation expense	2,076	64
Stock options
Share-based Payment Arrangement, Expense
Stock based compensation expense	1,006	710
Matching shares
Share-based Payment Arrangement, Expense
Stock based compensation expense	2	0
Restricted stock units
Share-based Payment Arrangement, Expense
Stock based compensation expense	$ 13,659	$ 0