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Revenues
 3 Months Ended
Mar. 31, 2024
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Disaggregated Revenue
The following table presents disaggregated revenue in the following categories (in thousands):
 Three Months Ended March 31,
20242023
Contract Types:
Licensing$580 $553 
Engineering and other services4,456 5,801 
Biorefining revenue$5,036 $6,354 
Joint development agreements2,872 2,036 
Contract research1,473 1,256 
Joint development and contract research revenue$4,345 $3,292 
CarbonSmart product863 — 
Total Revenue
$10,244 $9,646 
The following table presents revenue from partners in collaborative arrangements and from grant contributions which are included in the table above as follows (in thousands):
 
Three Months Ended March 31,
2024
2023
Revenue from partners in collaborative agreements included in the Joint development agreements above
2,223 $1,088 
Revenue from grant contributions included in Engineering and other services above
1,156 3,067 
The following table presents disaggregation of the Company’s revenues by customer location for the three months ended March 31, 2024 and 2023 (in thousands):
Three Months Ended March 31,
20242023
North America$4,458 $4,232 
Europe, Middle East, Africa (EMEA)4,580 4,711 
Asia1,206 50 
Australia— 653 
Total Revenue
$10,244 $9,646 
Contract balances
The following table provides changes in contract assets and liabilities (in thousands):
Current Contract AssetsCurrent Contract LiabilitiesNon-current Contract Liabilities
Balance as of December 31, 2023$28,238 $3,198 $8,233 
Additions to unbilled accounts receivable10,120 — — 
Increases due to cash received— 3,208 — 
Unbilled accounts receivable recognized in trade receivables(9,091)— — 
Decrease on revaluation on currency(108)(1)(123)
Reclassification from long-term to short-term— 672 (672)
Reclassification to revenue as a result of performance obligations satisfied— (3,263)— 
Balance as of March 31, 2024$29,159 $3,814 $7,438 
The increase in contract assets was mostly due to unbilled accounts receivable resulting from revenue recorded under contracts with customers and grants where the Company performed engineering and other services, and primarily relates to contracts with government entities. The decrease in contract liabilities was primarily due to the recognition of revenue during the period related to advance payments previously received by the Company for engineering and other services contracts with customers. As of March 31, 2024 and December 31, 2023 the Company had $10,689 and $11,157, respectively, of billed accounts receivable, net of allowance.
The contract liability balance comprises unconditional payments received from the Company’s customers prior to the satisfaction of the related performance obligations. Such amounts are anticipated to be recorded as revenues when services are performed in subsequent periods. The Company expects to recognize the amounts classified as current contract liabilities in revenue within one year or less and those classified as non-current within two to three years.
Remaining performance obligations
Transaction price allocated to the remaining performance obligations represents contracted revenue that has not yet been recognized, which includes unearned revenue that will be recognized as revenue in future periods. Transaction price allocated to remaining performance obligations is influenced by several factors, including the length of the contract term compared to the research term and the existence of customer specific acceptance rights.
Remaining performance obligations consisted of the following (in thousands):
As of
March 31, 2024December 31, 2023
Current$3,814 $3,198 
Non-current7,4388,233
Total
$11,252 $11,431