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Revenue | 6 Months Ended
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Jun. 30, 2023
Revenue from Contract with Customer [Abstract] |
Revenue | Revenue Disaggregation of Revenue The Company disaggregates revenue from contracts with customers by geographic region, as the Company’s management believes it best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. The following tables present revenue disaggregated by geography of the customer’s shipping location for the three and six months ended June 30, 2023 and 2022:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
United States | $ | 12,175 |  |  | $ | 8,613 |  |  | $ | 24,605 |  |  | $ | 15,244 |
Greater China | 20,042 |  |  | 11,142 |  |  | 39,284 |  |  | 20,259 |
Europe | 8,696 |  |  | 3,601 |  |  | 12,494 |  |  | 7,654 |
Rest of North America | 2,602 |  |  | 870 |  |  | 4,384 |  |  | 2,331 |
Rest of Asia Pacific | 7,938 |  |  | 1,236 |  |  | 10,570 |  |  | 1,561 |
South America | 655 |  |  | 293 |  |  | 1,223 |  |  | 705 |
Total revenue | $ | 52,108 |  |  | $ | 25,755 |  |  | $ | 92,560 |  |  | $ | 47,754 |
Contract Balances Certain assets or liabilities are recorded depending on the timing of revenue recognition, billings and cash collections on a contract-by-contract basis. Contract liabilities primarily relate to deferred revenue, including advance consideration received from customers for contracts prior to the transfer of control to the customer, and therefore revenue is recognized upon delivery of products and services or as the services are performed. The following table presents the assets and liabilities associated with the engineering services contracts recorded on the condensed consolidated balance sheet as of June 30, 2023 and December 31, 2022:
| Balance Sheet Classification | June 30, 2023 |  | December 31, 2022
Unbilled revenue | Prepaid expenses and other current assets | $ | 9,008 |  |  | $ | 3,623 |
Contract liabilities | Accrued expenses and other current liabilities | $ | 1,467 |  |  | $ | 1,739 |
During the three months ended June 30, 2023 and 2022, the Company recognized $405 and $619, respectively, of revenue related to amounts that were previously included in deferred revenue at the beginning of the period. During the six months ended June 30, 2023 and 2022, the Company recognized $1,242 and $965, respectively, of revenue related to amounts that were previously included in deferred revenue at the beginning of the period. Deferred revenue fluctuates over time due to changes in the timing of payments received from customers and revenue recognized for services provided. Revenue related to remaining performance obligations represents the amount of contracted development arrangements that has not been recognized, which includes deferred revenue on the condensed consolidated balance sheet and unbilled amounts that will be recognized as revenue in future periods. As of June 30, 2023, the amount of performance obligations that have not been recognized as revenue was $21,630, of which approximately 85% is expected to be recognized as revenue over the next twelve months and the remainder thereafter. This amount excludes the value of remaining performance obligations for contracts with an original expected length of one year or less. Variable consideration that has been constrained is excluded from the amount of performance obligations that have not been recognized. Concentrations As identified below, some of our customers accounted for more than 10% of the Company’s total revenue for the three and six months ended June 30, 2023 and 2022:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Customer A | 14.5 | % |  | 39.2 | % |  | 14.8 | % |  | 37.7 | %
The loss of these customers would have a material impact on the Company’s condensed consolidated financial results. The largest customers represented 22% and 14% of accounts receivable as of June 30, 2023 and the one largest customer represented 38% of accounts receivable as of December 31, 2022. No other individual customer represented more than 10% of accounts receivable at either June 30, 2023 or December 31, 2022.

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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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