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Revenue from contracts with customers
 3 Months Ended
Mar. 31, 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 March 31,
20232022
Type of products or services
QCaaS$1,168 $1,384 
Professional services406 309 
Other revenue9 20 
Total revenue, net$1,583 $1,713 
Timing of revenue recognition
Revenue recognized over the time$1,542 $1,662 
Revenue recognized at a point in time41 51 
Total revenue, net$1,583 $1,713 
Other revenue includes printed circuit board sales.
The following table presents a summary of revenue by geography for the three months ended March 31, 2023 and 2022 (in thousands):
Three months ended March 31,
20232022
United States$247 $777 
Japan308 434 
Germany288 263 
United Kingdom231 — 
Other509 239 
Total revenue$1,583 $1,713 
"Other" includes 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 months ended March 31, 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 months ended March 31, 2023 and 2022.
Three months ended March 31,
20232022
Customer A15 %14 %
Customer B13 %13 %
As of March 31, 2023 and 2022, there were three and one significant customers that comprised ten percent or more of outstanding accounts receivable balances, respectively.
All revenues derived from major customers above are located in Germany and Europe during the three month period ended March 31, 2023 and the United States and Germany during the three month period ended March 31, 2022.
Contract balances
The following table provides information about account receivable, contract assets and liabilities as of March 31, 2023 and December 31, 2022 (in thousands):
March 31,December 31,
20232022
Contract assets:
Trade account receivable$542 $757 
Unbilled receivables, included in 'Prepaid expenses and other current assets'59 58 
Total contract assets601 815 
Contract liabilities:
Deferred revenue, current1,827 1,781 
Deferred revenue, noncurrent9 9 
Customer deposit, included in 'Accrued expenses and other current liabilities'45 45 
Total contract liabilities$1,881 $1,835 
Changes in deferred revenue from contracts with customers were as follows (in thousands):
March 31,December 31,
20232022
Balance at beginning of period$1,790 $2,719 
Deferral of revenue1,166 5,325 
Recognition of deferred revenue(1,120)(6,254)
Balance at end of period$1,836 $1,790 
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 March 31, 2023, the aggregate amount of remaining performance obligations that were unsatisfied or partially unsatisfied related to customer contracts was $1.8 million. This amount included deferred revenue on the Company’s condensed consolidated balance sheets, of which approximately 99% 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.