Summary of significant accounting policies (Tables)

9 Months Ended

Sep. 30, 2022

Accounting Policies [Abstract]

Allowance for Credit Losses for Trade Accounts Receivable

Activity related to our allowance for credit losses for trade accounts receivable was as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(in thousands)
Balance, beginning of period	$	479	$	480	$	391	$	530
Provision	48		37		310		93
Write-offs	(99)		(66)		(281)		(238)
Recoveries of amounts previously written off	34		9		42		75
Balance, end of period	$	462	$	460	$	462	$	460

Disaggregation of Revenue

Revenue from subscription and non-subscription contractual arrangements were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(in thousands)
SaaS subscription and support and maintenance	$	112,351	$	83,775	$	312,992	$	222,672
On‑premise subscription	6,173		6,925		17,140		23,228
Subscription revenue	118,524		90,700		330,132		245,900
Professional services	5,216		4,083		14,187		12,015
Perpetual licenses	817		838		4,134		4,671
Non‑subscription revenue	6,033		4,921		18,321		16,686
Total revenue	$	124,557	$	95,621	$	348,453	$	262,586

Contract with Customer Asset and Liability

The opening and closing balances of contract assets were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(in thousands)
Balance, beginning of the period	$	1,840	$	1,596	$	1,792	$	947
Balance, end of the period	1,775		1,726		1,775		1,726
Change	$	(65)	$	130	$	(17)	$	779

Changes in contract liabilities, including revenue earned during the period from the beginning contract liability balance and new deferrals of revenue during the period, were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
	(in thousands)
Balance, beginning of the period	$	316,952	$	238,457	$	282,128	$	205,509
Acquisitions	—		5,200		—		5,200
Revenue earned	(96,542)		(71,574)		(199,357)		(144,038)
Deferral of revenue	120,820		98,284		258,459		203,696
Balance, end of the period	$	341,230	$	270,367	$	341,230	$	270,367