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Stockholders' Equity - Common Stock and Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 29, 2021
Sep. 30, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Collaborative Agreements              
Proceeds from warrants exercised         $ 19,230 $ 0  
Debt conversion, converted instrument, shares issued (in shares)     472,356        
Common stock, par value (in dollars per share)   $ 0.01 $ 0.01   $ 0.01   $ 0.01
Equity component of the convertible notes     $ 2,640   $ 2,661    
Proceeds from private placement         199,750 $ 0  
Additional Paid-In Capital              
Collaborative Agreements              
Equity component of the convertible notes     $ 2,635   $ 2,656    
Common Stock              
Collaborative Agreements              
Stock issued from equity financing (in shares)     11,296,660   11,296,660    
Equity component of the convertible notes     $ 5   $ 5    
Convertible Senior Notes 2016, Due 2023 | Convertible Notes              
Collaborative Agreements              
Debt conversion, converted instrument, amount     $ 2,800        
Stock Exercises at $7.06              
Collaborative Agreements              
Warrants exercise price (in dollars per share)       $ 7.06      
Stock Exercises at $7.98              
Collaborative Agreements              
Warrants exercise price (in dollars per share)       $ 7.98      
Proceeds from warrants exercised       $ 19,200      
Private Placement              
Collaborative Agreements              
Warrants exercise price (in dollars per share)   $ 0.01 $ 0.01   $ 0.01    
Number of shares issued, private placement (in shares) 11,296,660 11,296,660          
Stock issued (in dollars per share) $ 10.18 $ 10.18 $ 10.18   $ 10.18    
Number of common shares called by warrants (in shares) 8,349,705 8,349,705 8,349,705   8,349,705    
Proceeds from private placement         $ 199,800    
Outstanding warrants, convertible to common stock | Stock Exercises at $7.06              
Collaborative Agreements              
Stock issued from equity financing (in shares)       1,260,000      
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 | Private Placement              
Collaborative Agreements              
Stock issued (in dollars per share) $ 10.17 $ 10.17 $ 10.17   $ 10.17