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Fair Value Measurements - Weighted average assumptions (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Exercise Price $ 8.00 $ 8.00
Market value of common stock $ 1.34 $ 1.25
Warrants to purchase shares of common stock 92,212 92,212
Measurement Input, Risk Free Interest Rate [Member]    
Risk-free interest rate 0.16% 0.12%
Measurement Input, Price Volatility [Member]    
Expected volatility 140.08 137.89
Measurement Input, Expected Term [Member]    
Expected term (in years) 10 months 24 days 1 year 1 month 6 days
Measurement Input, Expected Dividend Rate [Member]    
Expected dividend yield 0.00% 0.00%