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Stockholders' Equity - Schedule of Common Stock Warrants Outstanding (Details) - $ / shares
6 Months Ended
Jun. 30, 2021
Feb. 28, 2018
Class of Warrant or Right [Line Items]    
Shares underlying outstanding warrants (in shares) 1,856,143  
Exercise price (in usd per share)   $ 3.00
Warrants Expiring on December 1, 2021    
Class of Warrant or Right [Line Items]    
Shares underlying outstanding warrants (in shares) 2,906  
Exercise price (in usd per share) $ 120.40  
Expiration Date Dec. 01, 2021  
Warrants Expiring on December 6, 2021    
Class of Warrant or Right [Line Items]    
Shares underlying outstanding warrants (in shares) 3,737  
Exercise price (in usd per share) $ 120.40  
Expiration Date Dec. 06, 2021  
Warrants Expiring on April 4, 2026    
Class of Warrant or Right [Line Items]    
Shares underlying outstanding warrants (in shares) 6,500  
Exercise price (in usd per share) $ 10.00  
Expiration Date Apr. 04, 2026  
Warrants Expiring on February 15, 2023    
Class of Warrant or Right [Line Items]    
Shares underlying outstanding warrants (in shares) 1,843,000  
Exercise price (in usd per share) $ 0.96  
Expiration Date Feb. 15, 2023