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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Warrants outstanding [Roll Forward]      
Outstanding, beginning of period (in shares) 93,835 20  
Warrants issued (in shares) 1,826,579 100,352  
Warrants exercised (in shares) (11,285) (6,536)  
Warrants expired (in shares)   (1)  
Warrants exchanged (in shares) (82,521)    
Outstanding, end of period (in shares) 1,826,608 93,835 20
Warrants, Weighted Average Exercise Price [Roll Forward]      
Outstanding, beginning of period (in dollars per share) $ 151 $ 4,868,205,366  
Warrants issued (in dollars per share) 42 222  
Warrants exercised (in dollars per share) 7 1,252  
Warrants expired (in dollars per share)   13,798,400,000  
Warrants exchanged (in dollars per share) 170    
Outstanding, end of period (in dollars per share) $ 23 $ 151 $ 4,868,205,366
Weighted average remaining life 4 years 11 months 26 days 5 years 9 months 4 years 10 months 17 days
Minimum [Member]      
Warrants, Exercise Price per Share [Roll Forward]      
Outstanding, (in dollars per share) $ 7 $ 7 $ 857,500
Maximum [Member]      
Warrants, Exercise Price per Share [Roll Forward]      
Outstanding, (in dollars per share) $ 23 $ 7,000 $ 13,798,400,000