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STOCK-BASED COMPENSATION - Schedule of Income Statement Location for Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 2,907	$ 1,681	$ 5,458	$ 2,835
Cost of Revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	0	0	2	1
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,105	532	2,216	979
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	72	107	140	180
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,730	$ 1,042	$ 3,100	$ 1,675

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
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