Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Estimated Fair Value of Equity Securities Assumptions (Details)

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Fair Value Measurements - Estimated Fair Value of Equity Securities Assumptions (Details) - $ / shares
Mar. 31, 2022
Dec. 31, 2021
Closing Common Stock Price [Member]    
Fair Value Measurements    
Closing stock price (in dollars per share) $ 3.38 $ 4.78