Stockholders' Equity - Equity Incentive Plans - Additional Information (Details) |
12 Months Ended |
|---|---|
|
Dec. 31, 2020
Plan
| |
| Class Of Stock [Line Items] | |
| Number of equity incentive plans | 2 |
| 2008 Plan and 2017 Plan | Employee Stock Option | |
| Class Of Stock [Line Items] | |
| Percentage of voting rights | 10.00% |
| 2008 Plan and 2017 Plan | Employee Stock Option | Minimum | 10% Shareholder | |
| Class Of Stock [Line Items] | |
| Stock option fair market value at the date of grant, percent | 110.00% |