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Summary of Significant Accounting Policies - Revenue and Net income (loss) per share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Summary of Significant Accounting Policies
Unsatisfied performance obligation	$ 93,837		$ 93,837
Revenue	73,944	$ 60,317	210,758	$ 178,889
Software licenses transferred at a point in time
Summary of Significant Accounting Policies
Revenue	8,665	8,274	30,719	28,652
Software licenses transferred over time
Summary of Significant Accounting Policies
Revenue	10,603	9,443	30,565	27,273
Service revenues earned over time
Summary of Significant Accounting Policies
Revenue	$ 54,676	$ 42,600	$ 149,474	$ 122,964
Minimum
Contract Balances
Subscription term			1 year
Maximum
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Subscription term			3 years

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