Revenue from contracts with customers (Tables)

6 Months Ended

Jun. 30, 2023

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue

The following table depicts the disaggregation of revenue by type of products or services and timing of transfer of products or services (in thousands):

	Three months ended June 30,
	2023		2022
Type of products or services
QCaaS	$	1,032	$	1,176
Professional services	655		156
Other revenue	20		39
Total revenue, net	$	1,707	$	1,371
Timing of revenue recognition
Revenue recognized over the time	$	1,665	$	1,296
Revenue recognized at a point in time	42		75
Total revenue, net	$	1,707	$	1,371

	Six months ended June 30,
	2023		2022
Type of products or services
QCaaS	$	2,201	$	2,560
Professional services	1,061		464
Other revenue	28		59
Total revenue, net	$	3,290	$	3,083
Timing of revenue recognition
Revenue recognized over the time	$	3,207	$	2,957
Revenue recognized at a point in time	83		126
Total revenue, net	$	3,290	$	3,083

The following table presents a summary of revenue by geography for the three and six months ended June 30, 2023 and 2022 (in thousands):

	Three months ended June 30,
	2023		2022
United States	$	485	$	655
Japan	263		282
Germany	284		257
Switzerland	274		—
United Kingdom	170		—
Other	231		177
Total revenue	$	1,707	$	1,371

	Six Months Ended June 30,
	2023		2022
United States	$	731	$	1,439
Japan	621		709
Germany	578		520
Switzerland	375		—
United Kingdom	401		—
Other	584		415
Total revenue	$	3,290	$	3,083

Significant customers

The tables below present the significant customers on a percentage of total revenue basis for the three and six months ended June 30, 2023 and 2022.

	Three months ended June 30,
	2023		2022
Customer A	16	%	17	%
Customer B	14	%	14	%
Customer C	9	%	11	%

	Six Months Ended June 30,
	2023		2022
Customer A	14	%	15	%
Customer B	11	%	14	%
Customer C	10	%	10	%

Accounts receivable, contract assets and liabilities, and changes in deferred revenue

The following table provides information about account receivable, contract assets and liabilities as of June 30, 2023 and December 31, 2022 (in thousands):

	June 30,		December 31,
	2023		2022
Contract assets:
Trade account receivable	$	803	$	757
Unbilled receivables, included in 'Prepaid expenses and other current assets'	69		58
Total contract assets	$	872	$	815
Contract liabilities:
Deferred revenue, current	2,827		1,781
Deferred revenue, noncurrent	120		9
Customer deposit, included in 'Accrued expenses and other current liabilities'	45		45
Total contract liabilities	$	2,992	$	1,835

Changes in deferred revenue from contracts with customers were as follows (in thousands):

	June 30,
	2023
Balance at beginning of period	$	1,790
Deferral of revenue	3,227
Recognition of deferred revenue	(2,070)
Balance at end of period	$	2,947