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Acquisitions - Censa Acquisition (Details) - USD ($)
$ in Thousands
 12 Months Ended
May 29, 2020
Dec. 31, 2020
Acquisitions    
Issuance of common stock related to acquisition   $ 42,869
Censa [Member]    
Acquisitions    
Payments for asset acquisitions $ 15,000  
Payments for asset acquisitions, upfront payment 10,400  
Payments for asset acquisitions, net assets $ 4,600  
Issuance of common stock related to acquisition (in shares) 845,364  
Issuance of common stock related to acquisition $ 42,900  
Acquisition costs 700  
Total consideration 58,600  
Fair value of net assets acquired 4,600  
Asset acquisition, cash and cash equivalents 3,800  
Asset acquisition, other current assets 800  
Asset acquisition, in-process research and development 54,000  
Asset acquisition, development and regulatory milestones 109,000  
Asset acquisition, initial milestone 30,000  
Censa [Member] | Maximum    
Acquisitions    
Asset acquisition, milestone, amount 217,500  
Asset acquisition, net sales milestone $ 160,000  
Censa [Member] | Research and development    
Acquisitions    
Asset acquisition, research and development expense   53,300
Censa [Member] | Selling, general and administrative    
Acquisitions    
Acquisition costs   $ 700