Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2020 |
Dec. 31, 2019 |
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
$ 547,899
|
$ 360,793
|
$ 265,398
|
| Related party revenue |
1,284
|
3,386
|
6,825
|
| Total net revenue |
549,183
|
364,179
|
272,223
|
| United States |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Total net revenue |
547,026
|
361,547
|
265,647
|
| International |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Total net revenue |
2,157
|
2,632
|
6,576
|
| Lifetime subscriptions |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Total net revenue |
192,273
|
134,525
|
98,578
|
| Term subscriptions |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Total net revenue |
351,608
|
221,740
|
162,062
|
| Non-subscription revenue |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Total net revenue |
5,302
|
7,914
|
11,583
|
| Transferred over time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Related party revenue |
0
|
0
|
0
|
| Total net revenue |
543,881
|
356,265
|
260,640
|
| Transferred at a point in time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Related party revenue |
1,284
|
3,386
|
6,825
|
| Total net revenue |
5,302
|
7,914
|
11,583
|
| Subscriptions |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
543,881
|
356,265
|
260,640
|
| Subscriptions | Transferred over time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
543,881
|
356,265
|
260,640
|
| Subscriptions | Transferred at a point in time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
0
|
0
|
0
|
| Advertising |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
2,479
|
1,965
|
2,669
|
| Advertising | Transferred over time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
0
|
0
|
0
|
| Advertising | Transferred at a point in time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
2,479
|
1,965
|
2,669
|
| Revenue Share (Third-party) |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
1,539
|
2,563
|
2,089
|
| Revenue Share (Third-party) | Transferred over time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
0
|
0
|
0
|
| Revenue Share (Third-party) | Transferred at a point in time |
|
|
|
| Disaggregation of Revenue [Line Items] |
|
|
|
| Net revenue |
$ 1,539
|
$ 2,563
|
$ 2,089
|