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STOCK-BASED COMPENSATION PLANS - stock-based compensation expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Total stock based compensation expense	$ 401	$ 579	$ 509	$ 1,076
Cost of Revenue
Total stock based compensation expense	15	2	30	9
Sales and marketing expense
Total stock based compensation expense	15	98	30	127
General and administrative
Total stock based compensation expense	$ 371	$ 479	$ 449	$ 940

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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