Segment Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Number of reportable segments | segment			2
Revenues:
Subscription, transaction, and services	$ 42,508	$ 32,732	$ 120,157	$ 97,440
Reimbursable costs	8,854	8,625	26,112	26,085
Total revenues	51,362	41,357	146,269	123,525
Cost of revenues:
Cost of subscription, transaction, and services revenue	11,255	9,368	32,729	27,981
Cost of reimbursable costs	8,854	8,625	26,112	26,085
Total cost of revenues, excluding depreciation and amortization	20,109	17,993	58,841	54,066
Gross profit:
Total segment gross profit (loss)	$ 31,253	$ 23,364	$ 87,428	$ 69,459
Total segment gross margin	61.00%	56.00%	60.00%	56.00%
Subscription, transaction, and services gross margin	74.00%	71.00%	73.00%	71.00%
Unallocated amounts:
Sales, marketing, research, development, general and administrative expenses	$ 47,147	$ 33,601	$ 130,378	$ 97,708
Depreciation and amortization	2,191	1,205	6,218	3,924
Impairment and restructuring	4,636	0	18,520	0
Other income (expense)	(1,261)	(275)	(1,271)	12,421
Loss before income taxes	(21,460)	(11,167)	(66,417)	(44,594)
Subscription and transaction fees
Revenues:
Subscription, transaction, and services	39,259	30,376	110,978	89,631
Services and other
Revenues:
Subscription, transaction, and services	3,249	2,356	9,179	7,809
Operating segments | Software and Payments
Revenues:
Subscription, transaction, and services	35,153	26,009	98,298	76,276
Reimbursable costs	0	0	0	0
Total revenues	35,153	26,009	98,298	76,276
Cost of revenues:
Cost of subscription, transaction, and services revenue	4,898	3,833	14,325	11,224
Cost of reimbursable costs	0	0	0	0
Total cost of revenues, excluding depreciation and amortization	4,898	3,833	14,325	11,224
Gross profit:
Total segment gross profit (loss)	$ 30,255	$ 22,176	$ 83,973	$ 65,052
Total segment gross margin	86.00%	85.00%	85.00%	85.00%
Subscription, transaction, and services gross margin	86.00%	85.00%	85.00%	85.00%
Operating segments | Software and Payments | Subscription and transaction fees
Revenues:
Subscription, transaction, and services	$ 35,153	$ 26,009	$ 98,298	$ 76,276
Operating segments | Software and Payments | Services and other
Revenues:
Subscription, transaction, and services	0	0	0	0
Operating segments | Print
Revenues:
Subscription, transaction, and services	4,106	4,367	12,680	13,355
Reimbursable costs	8,854	8,625	26,112	26,085
Total revenues	12,960	12,992	38,792	39,440
Cost of revenues:
Cost of subscription, transaction, and services revenue	1,572	1,706	4,745	5,532
Cost of reimbursable costs	8,854	8,625	26,112	26,085
Total cost of revenues, excluding depreciation and amortization	10,426	10,331	30,857	31,617
Gross profit:
Total segment gross profit (loss)	$ 2,534	$ 2,661	$ 7,935	$ 7,823
Total segment gross margin	20.00%	20.00%	20.00%	20.00%
Subscription, transaction, and services gross margin	62.00%	61.00%	63.00%	59.00%
Operating segments | Print | Subscription and transaction fees
Revenues:
Subscription, transaction, and services	$ 4,106	$ 4,367	$ 12,680	$ 13,355
Operating segments | Print | Services and other
Revenues:
Subscription, transaction, and services	0	0	0	0
All other
Revenues:
Subscription, transaction, and services	3,249	2,356	9,179	7,809
Reimbursable costs	0	0	0	0
Total revenues	3,249	2,356	9,179	7,809
Cost of revenues:
Cost of subscription, transaction, and services revenue	4,785	3,829	13,659	11,225
Cost of reimbursable costs	0	0	0	0
Total cost of revenues, excluding depreciation and amortization	4,785	3,829	13,659	11,225
Gross profit:
Total segment gross profit (loss)	$ (1,536)	$ (1,473)	$ (4,480)	$ (3,416)
Total segment gross margin	(47.00%)	(63.00%)	(49.00%)	(44.00%)
Subscription, transaction, and services gross margin	(47.00%)	(63.00%)	(49.00%)	(44.00%)
All other | Subscription and transaction fees
Revenues:
Subscription, transaction, and services	$ 0	$ 0	$ 0	$ 0
All other | Services and other
Revenues:
Subscription, transaction, and services	$ 3,249	$ 2,356	$ 9,179	$ 7,809