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Stockholders' Equity - Common Stock and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 31, 2021
Feb. 28, 2021
Mar. 31, 2021
Mar. 31, 2020
Collaborative Agreements        
Proceeds from exercise of warrants     $ 19,230 $ 0
Outstanding warrants, convertible to common stock        
Collaborative Agreements        
Stock issued from equity financing (in shares)   1,050,000    
Proceeds from exercise of warrants $ 11,800 $ 7,400    
Outstanding warrants, convertible to common stock | Stock Exercises at $7.98        
Collaborative Agreements        
Stock issued from equity financing (in shares) 1,294,999      
Outstanding warrants, convertible to common stock | Stock Exercises at $7.06        
Collaborative Agreements        
Stock issued from equity financing (in shares) 210,000      
Outstanding warrants, convertible to common stock | Common Stock        
Collaborative Agreements        
Warrants exercise price (in dollars per share)   $ 7.06    
Outstanding warrants, convertible to common stock | Common Stock | Stock Exercises at $7.98        
Collaborative Agreements        
Warrants exercise price (in dollars per share) $ 7.98   $ 7.98  
Outstanding warrants, convertible to common stock | Common Stock | Stock Exercises at $7.06        
Collaborative Agreements        
Warrants exercise price (in dollars per share) $ 7.06   $ 7.06