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Liability Related to Sale of Future Royalties to RPI - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Feb. 28, 2017
Dec. 31, 2020
Dec. 31, 2019
Liability Related to Sale of Future Royalties [Line Items]      
Purchase of common stock shares   71,015,183 59,172,124
Liabilities   $ 420,420 $ 300,751
Royalty Purchase Agreement [Member]      
Liability Related to Sale of Future Royalties [Line Items]      
Cash payment under royalty agreement $ 90,000    
Purchase of common stock shares 875,656    
Stock issued during period, value, issued for services $ 10,000    
Liabilities $ 92,300    
Imputed rate of interest on unamortized liability   15.00% 17.00%
Royalty Purchase Agreement [Member] | Minimum [Member]      
Liability Related to Sale of Future Royalties [Line Items]      
Percent of royalty on net sale 4.50%    
Royalty Purchase Agreement [Member] | Maximum [Member]      
Liability Related to Sale of Future Royalties [Line Items]      
Additional percent of royalty on net sale 1.00%