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Cost of Revenue - Summary of Cost of Revenue (Detail) | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Cost of Revenue [Abstract] |  |  |  |
Cost of vehicle | ¥ 2,210,715,054 | $ 346,909,433 | ¥ 619,227,148 | ¥ 11,176,116
Commission to car dealerships | 375,702,902 | 58,955,984 | 117,985,878 | 158,100,562
Leasing interest expense | 119,692,726 | 18,782,401 | 132,322,922 | 116,965,519
Staff cost | 105,771,335 | 16,597,831 | 73,975,397 | 72,999,170
Staff incentive | 61,894,967 | 9,712,671 | 84,046,881 | 98,173,090
Others | 84,232,888 | 13,217,977 | 70,562,523 | 81,852,960
Cost of revenue | ¥ 2,958,009,872 | $ 464,176,297 | ¥ 1,098,120,749 | ¥ 539,267,417

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