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Accounting for Share-Based Payments - Weighted-Average Assumptions Used Black Scholes Model (Details) - Stock options - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Price of Hepion common stock (in dollars per share) $ 1.70 $ 2.50
Risk-free interest rate 1.35% 0.34%
Dividend yield 0.00% 0.00%
Expected volatility 119.20% 126.30%
Expected term (in years) 5 years 10 months 24 days 6 years