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Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Jun. 30, 2022
Nov. 03, 2020
Jul. 15, 2019
Class of Warrant or Right [Line Items]          
Warrants issued (in shares)         2,000,000
Warrant exercise price (in dollars per share)         $ 0.001
Exercise of warrants (in shares) 0 0      
Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Warrants issued (in shares)     8,850,000    
Pre-Funded Warrants          
Class of Warrant or Right [Line Items]          
Warrants issued (in shares)     4,000,000    
Minimum | Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Warrant exercise price (in dollars per share)     $ 0.96    
Maximum | Common Stock Warrants          
Class of Warrant or Right [Line Items]          
Warrant exercise price (in dollars per share)     $ 1.09    
Senior secured notes due 2025 - first additional offering          
Class of Warrant or Right [Line Items]          
Fair value of warrants $ 6,800        
Change in fair value of warrant $ 735        
Senior secured notes due 2025 - first additional offering | Maximum          
Class of Warrant or Right [Line Items]          
Warrants issued (in shares) 2,143,000        
Senior secured notes due 2025          
Class of Warrant or Right [Line Items]          
Warrants issued (in shares)       714,000  
Interest rate         12.50%