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Revenue from contracts with customers | 9 Months Ended
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Sep. 30, 2023
Revenue from Contract with Customer [Abstract] |
Revenue from contracts with customers | 5. 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 September 30,
| 2023 |  | 2022
Type of products or services |  |  |
QCaaS | $ | 1,132 |  |  | $ | 1,346 |
Professional services | 1,421 |  |  | 347 |
Other revenue | 9 |  |  | 2 |
Total revenue | $ | 2,562 |  |  | $ | 1,695 |
Timing of revenue recognition |  |  |
Revenue recognized over time | $ | 2,506 |  |  | $ | 1,660 |
Revenue recognized at a point in time | 56 |  |  | 35 |
Total revenue | $ | 2,562 |  |  | $ | 1,695 |
| Nine months ended September 30,
| 2023 |  | 2022
Type of products or services |  |  |
QCaaS | $ | 3,333 |  |  | $ | 3,905 |
Professional services | 2,482 |  |  | 812 |
Other revenue | 37 |  |  | 61 |
Total revenue | $ | 5,852 |  |  | $ | 4,778 |
Timing of revenue recognition |  |  |
Revenue recognized over time | $ | 5,713 |  |  | $ | 4,618 |
Revenue recognized at a point in time | 139 |  |  | 160 |
Total revenue | $ | 5,852 |  |  | $ | 4,778 |
Other revenue includes training and printed circuit board sales. The following tables present a summary of revenue by geography, based on the addresses of our customers, for the three and nine months ended September 30, 2023 and 2022 (in thousands):
| Three months ended September 30,
| 2023 |  | 2022
United States | $ | 1,083 |  |  | $ | 951 |
Japan | 299 |  |  | 293 |
Germany | 287 |  |  | 237 |
Switzerland | 311 |  |  | — |
Other | 582 |  |  | 214 |
Total revenue | $ | 2,562 |  |  | $ | 1,695 |
| Nine Months Ended September 30,
| 2023 |  | 2022
United States | $ | 1,814 |  |  | $ | 2,461 |
Japan | 920 |  |  | 1,008 |
Germany | 865 |  |  | 757 |
Switzerland | 686 |  |  | — |
Other | 1,567 |  |  | 552 |
Total revenue | $ | 5,852 |  |  | $ | 4,778 |
"Other" includes the rest of Europe, the Middle East, Africa, Asia, Canada and Australia where the revenue from a single country is not greater tha n 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 nine months ended September 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 nine months ended September 30, 2023 and 2022.
| Three months ended September 30,
| 2023 |  | 2022
Customer A | 13 | % |  | 15 | %
Customer B | 9 | % |  | 11 | %
Customer C | — | % |  | 10 | %
Customer D | 12 | % |  | — | %
Customer E | 12 | % |  | — | %
| Nine Months Ended September 30,
| 2023 |  | 2022
Customer A | 2 | % |  | 13 | %
Customer B | 12 | % |  | 13 | %
Customer C | 12 | % |  | — | %
As of September 30, 2023 and December 31, 2022, there were three 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 nine month period ended September 30, 2023 and the United States and Germany during the three and nine month period ended September 30, 2022. Contract balances The following table provides information about account receivable, contract assets and liabilities as of September 30, 2023 and December 31, 2022 (in thousands):
| September 30, |  | December 31,
| 2023 |  | 2022
Contract assets: |  |  |
Trade accounts receivable, excluding unbilled receivables | $ | 395 |  |  | $ | 757 |
Unbilled receivables 1 | 368 |  |  | 58 |
Total contract assets | $ | 763 |  |  | $ | 815 |
Contract liabilities: |  |  |
Deferred revenue, current | $ | 2,177 |  |  | $ | 1,781 |
Deferred revenue, noncurrent | 92 |  |  | 9 |
Customer deposit 2 | 45 |  |  | 45 |
Total contract liabilities | $ | 2,314 |  |  | $ | 1,835 |
1 As of December 31, 2022, there was an immaterial amount of unbilled receivables classified as prepaid expenses and other current assets on the condensed consolidated balance sheets. 2 Customer deposit is included in "Accrued expenses and other current liabilities" on the condensed consolidated balance sheets. The allowance for doubtful accounts balance was nil as of September 30, 2023 and December 31, 2022, respectively. Changes in deferred revenue from contracts with customers were as follows (in thousands):
|  |  | Nine months ended September 30, 2023
Balance at beginning of period |  |  | $ | 1,790 |
Deferral of revenue |  |  | 4,353 |
Recognition of deferred revenue |  |  | (3,874) |
Balance at end of period |  |  | $ | 2,269 |
Total deferred revenue as of December 31, 2022 was $1.8 million, of which $1.7 million was recognized as revenues during the nine months ended September 30, 2023. 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 September 30, 2023, the aggregate amount of remaining performance obligations that were unsatisfied or partially unsatisfied related to customer contracts was $4.4 million. This amount included deferred revenue on the Company’s condensed consolidated balance sheets, of which approximately 84% is expected to be recognized to revenue in the next 12 months.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-9 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-15 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (b)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-13 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Topic 606 -Publisher FASB -URI https://asc.fasb.org//606/tableOfContent + Details
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