Revenue - Additional Information (Details) $ in Millions |
12 Months Ended |
|---|---|
|
Dec. 31, 2019
USD ($)
| |
| Class C | |
| Disaggregation of revenue | |
| Upfront sales commission percentage | 1.00% |
| ASU 2014-09 | |
| Disaggregation of revenue | |
| Change in revenue | $ 18.7 |
| Change in operating expense | $ 18.7 |