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BUSINESS COMBINATION - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Jan. 25, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill	$ 61,321			$ 24,783	$ 24,783
Sofdesk
Business Acquisition [Line Items]
Net tangible assets acquired			$ 1,441
Intangible assets			9,200
Deferred tax asset			457
Goodwill			24,390
Net assets acquired			35,488
Sofdesk | Customer relationship
Business Acquisition [Line Items]
Intangible assets			$ 1,800
DIN's
Business Acquisition [Line Items]
Net tangible assets acquired		$ 1,541
Intangible assets		11,700
Goodwill		11,544
Net assets acquired		24,785
DIN's | Customer relationship
Business Acquisition [Line Items]
Intangible assets		$ 11,700

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