Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Segment Information - Additional Information (Details)

v3.22.1
Segment Information - Additional Information (Details) - Segment
12 Months Ended
Aug. 05, 2019
Dec. 31, 2021
Segment Reporting Information [Line Items]    
Number of operating segments 1 2
Number of operating segments met quantitative threshold percentage   10.00%
Number of reportable segments   2
Product Concentration Risk | Revenue Benchmark | Overseas Art Study Services and Other Educational Services | Maximum    
Segment Reporting Information [Line Items]    
Percentage of net revenue   75.00%