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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
May 13, 2019
May 10, 2019
May 08, 2019
Apr. 01, 2019
Nov. 09, 2018
Jan. 07, 2019
Subsequent Events.            
Common stock minimum bid price required for Nasdaq listing rule $ 1.00          
Common stock minimum bid price required to regain compliance         $ 1.00  
Minimum number of consecutive business days needed to meet required minimum closing bid price         30 days  
Subsequent event            
Subsequent Events.            
Second grace period 180 days   180 days      
Grace period provided with minimum bid price to regain compliance     180 days      
Securities purchase agreement            
Subsequent Events.            
Price per share           $ 0.75
April Equity Line Offering | Securities purchase agreement | Subsequent event            
Subsequent Events.            
Number of shares authorized to issue       20,000,000    
Price per share       $ 0.28    
Number of shares issued       20,000,000    
Proposed Registered Offering | Maximum            
Subsequent Events.            
Proposed aggregate offer price   $ 10.0        
Proposed Registered Offering | Class A units            
Subsequent Events.            
Common Stock, Par or Stated Value Per Share   $ 0.00001        
Proposed Registered Offering | Class B units            
Subsequent Events.            
Common Stock, Par or Stated Value Per Share   $ 0.0001