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Revenues
 12 Months Ended
Dec. 31, 2025
Revenue from Contract with Customer [Abstract]  
Revenues Revenues
Disaggregated Revenue
The following table presents disaggregated revenue in the following categories (in thousands):
 Years Ended December 31,
20252024
Contract Types:
Licensing$19,843 $11,297 
Engineering and other services16,186 19,761 
Biorefining revenue$36,029 $31,058 
Joint development agreements2,425 6,226 
Contract research2,766 4,365 
Joint development and contract research revenue$5,191 $10,591 
CarbonSmart product14,625 7,943 
Total Revenue
$55,845 $49,592 
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):
 Years Ended December 31,
20252024
Revenue from partners in collaborative agreements included in the Joint development agreements above
$2,425 $5,573 
Revenue from grant contributions included in Engineering and other services above
5,766 6,403 
Revenue by Geographic Location
The following table presents disaggregation of the Company’s revenues by customer location for the years ended December 31, 2025 and 2024 (in thousands):
Years Ended December 31,
20252024
North America$24,682 $23,587 
Europe, Middle East, Africa (EMEA)14,644 16,260 
Asia16,519 8,862 
Australia— 883 
Total Revenue
$55,845 $49,592 
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, 2024$18,975 $6,168 $5,233 
Additions to unbilled accounts receivable21,204 — — 
Increases due to consideration received— 6,692 — 
Unbilled accounts receivable recognized in trade receivables(32,001)— — 
Allowance on doubtful contract assets(1,864)
Increase on revaluation on currency227 2 665 
Reclassification from long-term to short-term— 2 (2)
Reclassification to revenue because of performance obligations satisfied— (12,441)— 
Balance as of December 31, 2025$6,541 $423 $5,896 
The decrease in contract assets was mostly due to billing certain customers and government entities for engineering and other services that were previously recorded as contract assets. As of December 31, 2025 and December 31, 2024, the Company had $9,527 and $9,456, respectively, of billed accounts receivable, net of allowance.
The decrease in current contract liabilities was primarily due to the reclassification due to the satisfaction of performance obligations, while the increase in non-current contract liabilities was primarily due to revaluation of foreign exchange currency.
Remaining performance obligations
Transaction price allocated to the remaining performance obligations represents contracted revenue that has not yet been recognized, including unearned revenue to be recognized in future periods. Transaction price allocated to remaining performance obligations is influenced by factors such as project size, duration, contract modifications, and customer-specific acceptance rights. As of December 31, 2025, the Company had approximately $42,727 in contracted revenue remaining to be recognized, of which $14,779 is expected to be recognized in the next  twelve months.