Compensation and Other Benefit Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Share-based compensation expense | ||
| Stock-based compensation expense | $ 4,948 | $ 3,902 |
| Research and development | ||
| Share-based compensation expense | ||
| Stock-based compensation expense | 204 | 369 |
| General and administrative | ||
| Share-based compensation expense | ||
| Stock-based compensation expense | $ 4,744 | $ 3,533 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|