GOODWILL AND INTANGIBLE ASSETS, NET - Intangible assets, net (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 80,418		$ 80,418		$ 70,423
Accumulated amortization	(40,052)		(40,052)		(32,894)
Intangible assets net	40,366		40,366		37,529
Amortization expense	3,203	$ 2,721	8,758	$ 8,194
Internal use software
Finite-Lived Intangible Assets [Line Items]
Intangible assets	67,245		67,245		55,164
Impairment of internal use software	614	$ 0	614	$ 114
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 13,173		$ 13,173		$ 15,259

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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