| Summary of Disaggregation of Revenue |
The following tables depict the disaggregation of revenue according to the type of good or service and timing of transfer of goods or services for the three and six months ended June 30, 2023 and June 30, 2022: | | | | | | | | | Three Months Ended June 30, | (In thousands) | | 2023 | | 2022 | Collaborative research, other professional services and related materials | | $ | 2,484 | | $ | 1,477 | Access to quantum computing systems | | | 843 | | | 657 | | | $ | 3,327 | | $ | 2,134 |
| | | | | | | | | | Six Months Ended June 30, | | (In thousands) | | 2023 | | 2022 | | Collaborative research, other professional services and related materials | | $ | 4,294 | | $ | 2,992 | | Access to quantum computing systems | | | 1,233 | | | 1,246 | | | | $ | 5,527 | | $ | 4,238 | |
| | | | | | | | | Three Months Ended June 30, | (In thousands) | | 2023 | | 2022 | Revenue recognized at a point in time | | $ | 336 | | $ | — | Revenue recognized over time | | | 2,991 | | | 2,134 | | | $ | 3,327 | | $ | 2,134 |
| | | | | | | | | Six Months Ended June 30, | (In thousands) | | 2023 | | 2022 | Revenue recognized at a point in time | | $ | 336 | | $ | — | Revenue recognized over time | | | 5,191 | | | 4,238 | | | $ | 5,527 | | $ | 4,238 |
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| Summary of Contract with Customer, Contract Asset, Contract Liability, and Receivable |
Selected condensed consolidated balance sheet line items that reflect accounts receivable, contract assets and liabilities as of June 30, 2023 and December 31, 2022 were as follows: | | | | | | | | (In thousands) | | June 30, 2023 | | December 31, 2022 | | Trade receivables | | $ | 7,576 | | $ | 6,143 | | Unbilled receivables | | $ | 53 | | $ | 92 | | Deferred revenue | | $ | (833) | | $ | (961) | |
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| Summary of Change in Contract with Customer, Asset and Liability |
Changes in deferred revenue from contracts with customers were as follows: | | | | | | | | | | Six Months Ended June 30, | | (In thousands) | | 2023 | | 2022 | | Balance at beginning of period | | $ | (961) | | $ | (985) | | Deferral of revenue | | | (1,216) | | | (673) | | Recognition of deferred revenue | | | 1,344 | | | 550 | | Total deferred revenue at end of period | | $ | (833) | | $ | (1,108) | |
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