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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Warrants outstanding [Roll Forward]    
Outstanding, beginning of period (in shares) 1,826,608  
Warrants issued (in shares) 2,601,900  
Exercised (in shares) (6,000)  
Warrants expired (in shares) (9)  
Outstanding, end of period (in shares) 4,422,499 1,826,608
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 10.00  
Warrants, Weighted Average Exercise Price [Roll Forward]    
Outstanding, beginning of period (in dollars per share) 23.04  
Issued (in dollars per share) 10.00  
Exercised (in dollars per share) 0.01  
Warrants expired (in dollars per share) 7.00  
Outstanding, end of period (in dollars per share) $ 9.16 $ 23.04
Weighted average remaining life 4 years 8 months 12 days 5 years
Minimum [Member]    
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 0.01 $ 7.00
Maximum [Member]    
Warrants, Exercise Price per Share [Roll Forward]    
Outstanding, (in dollars per share) $ 10.00 $ 23.04