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Cost of revenue
 12 Months Ended
Mar. 31, 2023
Cost of revenue  
Cost of revenue

19.

Cost of revenue

Cost of revenue consisted of the following:

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For the years ended March 31,

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2023

    

2022

    

2021

Amortization expenses

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$

5,800,442

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$

7,751,161

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$

6,651,329

Depreciation expenses of server hardware

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3,943,495

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4,172,837

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3,689,815

Website maintenance fee

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1,510,417

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2,746,431

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1,565,281

Resource usage fees(1)

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1,510,417

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1,622,891

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1,407,768

Virtual simulation fees(2)

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555,560

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1,106,713

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1,279,050

Maintenance material consumption fees

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1,918

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15,458

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39,425

Employee compensation

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146,602

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160,338

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—

Employee benefit expenses

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10,281

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9,199

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—

Impairment(3)

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13,800,583

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—

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Other

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21,175

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88,171

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79,743

Total

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$

27,300,890

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$

17,673,199

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$

14,712,411

(1)Since November 2018, the Company started to pay resource usage fees to colleges and universities in order to access the online course resources of these institutions with a period of validity of 5 years.
(2)The Company paid virtual simulation fees to vendors Jiangsu Audio-visual Education Center in order to access virtual experimental training programs.
(3)The impairment includes the impairment to property, plant and equipment for $5,749,384, and the impairment to intangible asset for $ 8,051,199.