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Revenue from contracts with customers (Tables) | 6 Months Ended
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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 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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