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NATURE OF OPERATIONS - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Disaggregation of Revenue |  |  |  |
Warranty costs | $ 764 | $ 538 | $ 1,392 | $ 1,108
Product sales | 42,316 | 55,098 | 85,497 | 106,885
Dealer commission, reimbursed dealer expenses and other similar costs | 3,949 | 3,253 | $ 6,573 | 6,252
Annual curtail payment period |  |  | 2 years |
Period required to pay off remaining principle balance |  |  | 3 years |
Revenue from contract with customer product and service benchmark | Customer concentration risk | Pertaining to independent third parties |  |  |  |
Disaggregation of Revenue |  |  |  |
Product sales | $ 3,886 | $ 2,495 | $ 9,534 | $ 4,471
Concentration risk percentage | 9.60% | 4.50% | 11.80% | 4.20%
Revenue from contract with customer product and service benchmark | Customer concentration risk | Another independent third party and affiliates |  |  |  |
Disaggregation of Revenue |  |  |  |
Product sales | $ 480 | $ 3,296 | $ 2,449 | $ 6,194
Concentration risk percentage | 1.20% | 6.00% | 3.00% | 5.80%
Minimum |  |  |  |
Disaggregation of Revenue |  |  |  |
Term of lease agreement | 96 months |  | 96 months |
Maximum |  |  |  |
Disaggregation of Revenue |  |  |  |
Term of lease agreement | 120 months |  | 120 months |

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