Goodwill and Intangible Assets, Net - Summary of Company's Intangible Assets (Parenthetical) (Details) - Education assessment caseware |
12 Months Ended |
|---|---|
|
Dec. 31, 2019
item
grade
| |
| Intangible assets | |
| Number of subjects included | item | 3 |
| Number of grades of junior and senior high school included | grade | 6 |