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Organization - Schedule of Operations of VIEs (Details)
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2024
USD ($)
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Revenues ¥ 216,428,374 $ 29,650,566 ¥ 126,338,353 ¥ 577,493,364  
Net income/(loss) 91,731,395 12,567,149 39,133,539 (362,051,956)  
Cash and cash equivalents 4,263,311,636   7,207,343,478 3,486,376,077 $ 584,071,299
Time and structured deposits 2,009,018,598   1,554,120,849   275,234,419
Investment in equity method investee 146,100,984   136,804,441   20,000,000
Variable Interest Entity          
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items]          
Revenues 198 27 47,770,942 578,002,415  
Net income/(loss) (448,652,409) (61,465,128) ¥ 171,107,836 ¥ 221,602,406  
Cash and cash equivalents 2,187,000,000       300,000,000
Restricted cash 743,000,000       102,000,000
Time and structured deposits 784,000,000       107,000,000
Investment in equity method investee 2,544,000,000       $ 349,000,000
Expected credit loss for others ¥ 367,000,000 $ 50,000,000