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Stock-Based Compensation - Early Exercise of Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Sep. 30, 2020
Mar. 31, 2022
Stock-Based Compensation    
Proceeds from exercise of stock options $ 600 $ 33
Exercise of stock options (in shares) 135,525 22,744
Exercise price, lower range (in dollars per share) $ 4.406  
Exercise price, higher range (in dollars per share) $ 4.824  
Number of shares vested   95,916
Current liability from early exercises of stock options   $ 200