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Fair Value Measurements - Fair Value of Liabilities Measured on a Recurring Basis (Details) - USD ($)
Jun. 30, 2021
Jan. 13, 2021
Dec. 31, 2020
Jul. 23, 2019
Fair value of liabilities measured on a recurring basis        
Warrant liability $ 7,000   $ 179,000 $ 4,300,000
Fair value 6,933,000   0  
Total fair value 6,940,000   179,000  
Level 3        
Fair value of liabilities measured on a recurring basis        
Warrant liability 7,000   179,000  
Total fair value 6,940,000   $ 179,000  
Streeterville Note        
Fair value of liabilities measured on a recurring basis        
Fair value 6,933,000 $ 6,000,000.0    
Streeterville Note | Level 3        
Fair value of liabilities measured on a recurring basis        
Fair value $ 6,933