Summary of significant accounting policies (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2022		2021
	(in thousands)
Balance, beginning of period	$	391	$	530
Provision	122		156
Write-offs	(27)		(127)
Recoveries of amounts previously written off	6		44
Balance, end of period	$	492	$	603

Disaggregation of Revenue

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

	Three Months Ended March 31,
	2022		2021
	(in thousands)
SaaS subscription and support and maintenance	$	96,350	$	66,776
On‑premise subscription	5,851		7,706
Subscription revenue	102,201		74,482
Professional services	3,944		4,003
Perpetual licenses	2,113		2,242
Non‑subscription revenue	6,057		6,245
Total revenue	$	108,258	$	80,727

Contract with Customer Asset and Liability

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

	Three Months Ended March 31,
	2022		2021
	(in thousands)
Balance, beginning of the period	$	1,792	$	947
Balance, end of the period	1,885		1,186
Change	$	93	$	239

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 March 31,
	2022		2021
	(in thousands)
Balance, beginning of the period	$	282,128	$	205,509
Revenue earned	(85,337)		(60,633)
Deferral of revenue	95,708		76,703
Balance, end of the period	$	292,499	$	221,579