Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Property and equipment, net (Details)	12 Months Ended
Property and equipment, net (Details)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2022 USD ($)
Property and equipment, net
Total property and equipment	¥ 49,913,704		¥ 45,922,833		$ 7,236,807
Accumulated depreciation	(44,052,344)		(39,734,571)		(6,386,990)
Property and equipment, net	5,861,360		6,188,262		849,817
Depreciation	4,393,055	$ 636,933	6,215,253	¥ 10,114,779
Gains (loss) from the disposal of property and equipment	2,678	$ 388	180,537	¥ (59,213)
Computer and transmission equipment
Property and equipment, net
Total property and equipment	22,569,837		19,521,668		3,272,319
Furniture and office equipment
Property and equipment, net
Total property and equipment	2,820,000		2,781,360		408,862
Leasehold improvements
Property and equipment, net
Total property and equipment	23,707,764		22,803,702		3,437,302
Motor vehicles
Property and equipment, net
Total property and equipment	¥ 816,103		¥ 816,103		$ 118,324