Principal Accounting Policies - Narrative (Details)
¥ in Millions |
12 Months Ended |
|
|
|
|
Dec. 31, 2020
USD ($)
operatingSegment
reportableSegment
|
Dec. 31, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
Jan. 01, 2021
USD ($)
|
Dec. 31, 2020
CNY (¥)
|
Dec. 31, 2019
CNY (¥)
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
|
|
|
| Cash and cash equivalents |
$ 111,217,606
|
$ 105,603,153
|
|
|
|
|
| Cash equivalents |
10,000,000.0
|
0
|
|
|
|
|
| Other than temporary impairment losses, investments |
0
|
0
|
|
|
|
|
| Impairment of long-lived assets (excluding goodwill) |
0
|
|
|
|
|
|
| Goodwill impairment |
0
|
|
|
|
|
|
| Impairment of long-lived assets |
0
|
0
|
|
|
|
|
| Deferred offering costs |
$ 0
|
287,331
|
|
|
|
|
| Value added tax rate |
6.00%
|
|
|
|
|
|
| Advances from customers |
$ 1,338,516
|
920,925
|
|
|
|
|
| Contract with customer, liability, revenue recognized |
920,925
|
628,954
|
$ 358,213
|
|
|
|
| Capitalized contract cost, net |
0
|
0
|
|
|
|
|
| Marketing and advertising costs |
1,630,954
|
1,198,905
|
$ 580,342
|
|
|
|
| Capital lease obligations |
0
|
0
|
|
|
|
|
| Deferred tax liabilities, uncertain tax positions |
0
|
0
|
|
|
|
|
| Unrecognized tax benefits |
0
|
0
|
|
|
|
|
| Dividends |
$ 0
|
$ 0
|
|
|
|
|
| Number of operating segments | operatingSegment |
1
|
|
|
|
|
|
| Number of reportable segments | reportableSegment |
1
|
|
|
|
|
|
| PRC |
|
|
|
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
|
|
|
| Cash and cash equivalents | ¥ |
|
|
|
|
¥ 6.5
|
¥ 19.0
|
| Cumulative Effect, Period of Adoption, Adjustment | Subsequent Event |
|
|
|
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
|
|
|
| Right-of-use asset |
|
|
|
$ 6,800,000
|
|
|
| Operating lease, liability |
|
|
|
$ 6,800,000
|
|
|
| Maximum |
|
|
|
|
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
|
|
|
|
| Finite-lived intangible asset, useful life |
5 years
|
|
|
|
|
|