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Revenue from contracts with customers
 6 Months Ended
Jun. 30, 2023
Revenue from Contract with Customer [Abstract]  
Revenue from contracts with customers Revenue from contracts with customers
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,
20232022
Type of products or services
QCaaS$1,032 $1,176 
Professional services655 156 
Other revenue20 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 time42 75 
Total revenue, net$1,707 $1,371 
Six months ended June 30,
20232022
Type of products or services
QCaaS$2,201 $2,560 
Professional services1,061 464 
Other revenue28 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 time83 126 
Total revenue, net$3,290 $3,083 
Other revenue includes training and printed circuit board sales.
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,
20232022
United States$485 $655 
Japan263 282 
Germany284 257 
Switzerland274 — 
United Kingdom170 — 
Other231 177 
Total revenue$1,707 $1,371 

Six Months Ended June 30,
20232022
United States$731 $1,439 
Japan621 709 
Germany578 520 
Switzerland375 — 
United Kingdom401 — 
Other584 415 
Total revenue$3,290 $3,083 
"Other" includes the rest of Europe, the Middle East, Africa, Asia, Canada and Australia where the revenue from a single country is not greater than 10% of total consolidated revenue. The Company has not had any sales in China, Russia or Ukraine.
Significant customers
The Company had significant customers during the three and six months ended June 30, 2023 and 2022. A significant customer is defined as one that comprises up to ten percent or more of total revenues in a particular year or ten percent of outstanding accounts receivable balance as of the year end.
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,
20232022
Customer A16 %17 %
Customer B14 %14 %
Customer C9 %11 %
Six Months Ended June 30,
20232022
Customer A14 %15 %
Customer B11 %14 %
Customer C10 %10 %
As of June 30, 2023 and December 31, 2022, there were four and two significant customers that comprised ten percent or more of outstanding accounts receivable balances, respectively.
All revenues derived from major customers above are located in the United States, Germany and other European countries during the three and six month period ended June 30, 2023 and the United States and Germany during the three and six month period ended June 30, 2022.
Contract balances
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,
20232022
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, current2,827 1,781 
Deferred revenue, noncurrent120 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 revenue3,227 
Recognition of deferred revenue(2,070)
Balance at end of period$2,947 
Remaining performance obligations
A significant number of the Company’s product and service sales are short-term in nature with a contract term of one year or less. For those contracts, the Company has utilized the practical expedient in ASC 606-10-50-14 exempting the Company from disclosure of the transaction price allocated to remaining performance obligations if the performance obligation is part of a contract that has an original expected duration of one year or less.
As of June 30, 2023, the aggregate amount of remaining performance obligations that were unsatisfied or partially unsatisfied related to customer contracts was $2.9 million. This amount included deferred revenue on the Company’s condensed consolidated balance sheets, of which approximately 96% is expected to be recognized to revenue in the next 12 months.
As of December 31, 2022, the aggregate amount of remaining performance obligations related to customer contracts that are unsatisfied or partially unsatisfied was $1.8 million which included deferred revenue on the Company’s condensed consolidated balance sheets, of which approximately 99% was expected to be recognized to revenue in the next 12 months.