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Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
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    
Senior Secured Notes Due 2025 - First Additional Offering        
Class of Warrant or Right [Line Items]        
Warrant exercise price (in dollars per share) $ 0.001      
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%