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Revenue from contracts with customers (Tables) | 9 Months Ended
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Sep. 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 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 |
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 |
Significant customers | 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 | % |  | — | %
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 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 |

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