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Revenue Recognition | 3 Months Ended
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Mar. 31, 2022
Disaggregation of Revenue [Line Items] |
Revenue Recognition | 4. REVENUE RECOGNITION The following tables depict the disaggregation of revenue according to the type of good or service and timing of transfer of goods or services:​​​​​​​
|  | Three Months Ended March 31, |
|  | 2022 |  |  | 2021 |
Type of Goods or Service |  | (In thousands) |
Collaborative research and other professional services |  | $ | 1,515 |  |  | $ | 1,603 |
Access to quantum computing systems |  |  | 589 |  |  |  | 757 |
Quantum computing components |  | $ | 2,104 |  |  | $ | 2,360 |
Timing of Revenue Recognition |  |  |  |  |  |  |  |
Revenue recognized at a point in time |  | $ | — |  |  | $ | — |
Revenue recognized over time |  |  | 2,104 |  |  |  | 2,360 |
|  | $ | 2,104 |  |  | $ | 2,360 |
Selected condensed consolidated balance sheet line items that reflect accounts receivable, contract assets and liabilities as of March 31, 2022 and December 31, 2021 were as follows:
|  | March 31, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
|  | (In thousands) |
Trade receivables |  | $ | 1,147 |  |  | $ | 961 |
Unbilled receivables |  | $ | 114 |  |  | $ | 581 |
Deferred revenue |  | $ | (519 | ) |  | $ | (985 | )
Changes in deferred revenue from contracts with customers were as follows:
|  | March 31, |
|  | 2022 |
|  | (In thousands) |
Balance at beginning of period |  | $ | (985 | )
Deferral of revenue |  |  | (92 | )
Recognition of deferred revenue |  |  | 558 |
Balance at end of period |  | $ | (519 | )
Remaining performance obligations represent the portion of the transaction price that has not yet been satisfied or achieved. As of March 31, 2022, the aggregate amount of the transaction price allocated to remaining performance obligations was approximately $10.6 million. The Company expects to recognize estimated revenues related to performance obligations that are unsatisfied (or partially satisfied) in the amounts of approximately $5.3 million during the remainder of year ended December 31, 2022, and $5.3 million during the years ended December 31, 2023 and December 31, 2024. Deferred Contract Acquisition and Fulfillment Costs —The Company has not identified any costs that are incremental to the acquisition of customer contracts that would be capitalized as deferred costs on the balance sheet in accordance with ASC 340-40. Incremental costs incurred to fulfill the Company’s contracts that meet the capitalization criteria in ASC 340-40 have historically been immaterial. Accordingly, the Company has not capitalized any contract fulfillment costs as of March 31, 2022 and March 31, 2021.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130554-203045 + Details
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