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Revenue Recognition (Tables)
12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
Disaggregated revenues by major source for the years ended December 31, 2021 and 2020 consisted of the following (in thousands):

December 31, 2021December 31, 2020
Product revenue
Powertrains$2,152 $993 
Stepvans & vehicle incentives2,735 1,516 
Total product revenue4,887 2,509 
Ancillary revenue161 132 
Total revenue$5,048 $2,641