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Capitalization - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Warrants              
Net consideration received on transaction     $ 9,100   $ 28,100    
Number of shares issued in transaction (in shares)   0 173,956 0 542,470    
Issuance of common stock related to acquisition         $ 42,869    
Common stock, authorized shares (in shares)   250,000,000   250,000,000   250,000,000 125,000,000
Maximum              
Warrants              
Net consideration received on transaction $ 125,000            
Value of remaining shares available to be issued and sold in transaction   $ 93,000   $ 93,000      
Weighted Average              
Warrants              
Sale of stock, weighted average price per share (in USD per share)   $ 54.39   $ 53.37