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Subsequent Events - Proceeds from Sale of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Jul. 13, 2020
Apr. 07, 2020
Jun. 30, 2020
Subsequent Events      
Gross proceeds from sale of common stock and warrants excluding the proceeds from exercise of the warrants, if any     $ 5.1
Future plans | Pillar Investment Entities      
Subsequent Events      
Ownership percentage   19.99%  
Pillar Investment Entities      
Subsequent Events      
Stock issued (in shares)   3,039,514  
Shares of common stock that may be purchased upon exercise of warrants   3,039,514 3,039,514
Warrant exercise price (per share)   $ 2.28 $ 2.28
Gross proceeds from sale of common stock and warrants excluding the proceeds from exercise of the warrants, if any   $ 5.0  
Combined purchase price (per share)   $ 1.645  
Stock price underlying warrants (per share)   $ 0.125  
Ownership percentage     19.99%
Pillar Investment Entities | Future plans      
Subsequent Events      
Stock issued (in shares)   2,747,252  
Shares of common stock that may be purchased upon exercise of warrants   1,373,626  
Warrant exercise price (per share)   $ 2.71  
Gross proceeds from sale of common stock and warrants excluding the proceeds from exercise of the warrants, if any   $ 5.0  
Number of common warrants   0.5  
Stock price (in dollars per share)   $ 3.01  
Number of consecutive trading days   20 days  
Pillar Investment Entities | Future plans | Common stock warrants      
Subsequent Events      
Combined purchase price (per share)   $ 1.82  
Pillar Investment Entities | Future plans | Pre-funded Warrants      
Subsequent Events      
Warrant exercise price (per share)   0.01  
Combined purchase price (per share)   $ 1.81  
Subsequent Events | Future plans | Pillar Investment Entities      
Subsequent Events      
Ownership percentage 19.99%    
Subsequent Events | Pillar Investment Entities      
Subsequent Events      
Gross proceeds from sale of common stock and warrants excluding the proceeds from exercise of the warrants, if any $ 5.1    
Combined purchase price (per share) $ 1.845    
Stock price underlying warrants (per share) $ 0.125    
Ownership percentage 19.99%    
Subsequent Events | Pillar Investment Entities | Common stock warrants      
Subsequent Events      
Shares of common stock that may be purchased upon exercise of warrants 2,764,227    
Warrant exercise price (per share) $ 2.58    
Number of days of notice for changes to holding percentage 61 days    
Term of warrants 3 years    
Subsequent Events | Pillar Investment Entities | Pre-funded Warrants      
Subsequent Events      
Stock issued (in shares) 749,993    
Shares of common stock that may be purchased upon exercise of warrants 2,014,234    
Warrant exercise price (per share) $ 0.01    
Subsequent Events | Pillar Investment Entities | Future plans      
Subsequent Events      
Gross proceeds from sale of common stock and warrants excluding the proceeds from exercise of the warrants, if any $ 5.1    
Number of common warrants 0.35    
Stock price (in dollars per share) $ 6.50    
Subsequent Events | Pillar Investment Entities | Future plans | Common stock warrants      
Subsequent Events      
Shares of common stock that may be purchased upon exercise of warrants 274,615    
Warrant exercise price (per share) $ 9.75    
Stock price (in dollars per share) $ 0.04375    
Subsequent Events | Pillar Investment Entities | Future plans | Pre-funded Warrants      
Subsequent Events      
Stock issued (in shares) 784,615    
Warrant exercise price (per share) $ 0.01    
Stock price (in dollars per share) $ 6.45625