Stock-Based Compensation Plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 19, 2019 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Stock Based Compensation Plans [Line Items] | |||
| Stock option awards, weighted average fair value per share | $ 6.22 | $ 4.34 | |
| Unamortized stock-based compensation expense for outstanding options | $ 1.4 | ||
| Stock-based compensation expense | $ 0.8 | $ 0.6 | |
| Weighted average vesting period | 2 years 6 months | ||
| Stock Incentive Plan 2017 [Member] | |||
| Stock Based Compensation Plans [Line Items] | |||
| Increase in number of shares reserved for grant | 600,000 | ||
| Number of shares reserved for grant and issuance | 660,000 | ||
| Common stock shares reserved for future issuance | 190,224 | ||
| Expiration period (in years) | 10 years | ||
| Research and Development Expense [Member] | |||
| Stock Based Compensation Plans [Line Items] | |||
| Stock-based compensation expense | $ 0.2 | 0.1 | |
| General and Administrative Expense [Member] | |||
| Stock Based Compensation Plans [Line Items] | |||
| Stock-based compensation expense | $ 0.7 | $ 0.5 | |