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Revenue
 6 Months Ended
Jun. 30, 2022
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, 2022 and 2021:

Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
United States$8,613 $2,300 $15,244 $3,877 
Greater China11,142 5,222 20,259 10,209 
Europe3,601 605 7,654 811 
Rest of Asia Pacific1,236 136 1,561 575 
Rest of North America870 623 2,331 1,227 
South America293 294 705 595 
Total revenue$25,755 $9,180 $47,754 $17,294 

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 Company recorded unbilled revenue of $994 and $402 at June 30, 2022 and December 31, 2021, respectively, as part of its Prepaid expenses and other current assets in the accompanying consolidated balance sheets.
The following table presents the liabilities associated with the engineering services contracts as of June 30, 2022 and December 31, 2021:
June 30,
2022		December 31,
2021
Deferred revenue$1,768 $1,840 
As of June 30, 2022 and December 31, 2021, contract liabilities were included as Deferred revenue and classified as current liabilities in the condensed consolidated balance sheets.
During the three months ended June 30, 2022 and 2021, the Company recognized $619 and $206, 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, 2022 and 2021, the Company recognized $965 and $819, 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 consolidated balance sheet and unbilled amounts that will be recognized as revenue in future periods. As of June 30, 2022, the amount of performance obligations that have not been
recognized as revenue was $45,170, of which approximately 56% 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, 2022 and 2021:

Three Months Ended
June 30,		Six Months Ended
June 30,
2022202120222021
Customer A39.2 %38.5 %37.7 %45.8 %
Customer B— %12.6 %— %12.5 %
Customer C— %10.9 %— %5.8 %

The loss of these customers would have a material impact on the Company’s condensed consolidated financial results.
The largest customer represented 43% of accounts receivable as of June 30, 2022 and the one largest customer represented 31% of accounts receivable as of December 31, 2021. No other individual customer represented more than 10% of accounts receivable at either June 30, 2022 or December 31, 2021.