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Share-based compensation - Share-based compensation expense (Details) - Service-based options - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 764	$ 649	$ 1,575	$ 1,218
Unrecognized compensation expense	4,600		$ 4,600
Weighted average period over which unrecognized compensation expense would be recognized			2 years 1 month 6 days
Cost of revenues | Subscription
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	38	55	$ 76	118
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	111	143	222	236
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	141	95	298	185
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 474	$ 356	$ 979	$ 679

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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+ References

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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