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REVENUES - Company's disaggregation of revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Revenues $ 12,054 $ 10,790 $ 29,801 $ 43,403
Kirin Holdings Company, Limited [Member]        
Revenues 1,000      
Goods [Member]        
Revenues 4,506 3,296 12,260 11,975
Goods [Member] | Pfizer [Member]        
Revenues 1,135 3,165 7,883 5,844
Goods [Member] | Brazil [Member]        
Revenues 3,200   4,188 6,000
Goods [Member] | Chiesi [Member]        
Revenues 171 131 189 131
License and R&D Services [Member]        
Revenues 7,548 7,494 17,541 31,428
License and R&D Services [Member] | Chiesi US Agreement and Chiesi Ex US Agreement [Member] | Change in Accounting Method Accounted for as Change in Estimate [Member]        
Reduction To Accumulated Revenue Recognized     4,100  
License and R&D Services [Member] | Chiesi Ex US Agreement [Member]        
Revenues $ 6,500 $ 7,500 $ 16,500 $ 31,400