Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition Narrative (Details)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2018
Mar. 31, 2015
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Revenue recognized     $ 151 $ 607 $ 168 $ 1,653
Royalty revenue            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Revenue recognized     $ 151 0 168 $ 0
Collaborative Arrangement            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Non-refundable upfront fees $ 15,600 $ 11,000        
Development milestone payments   10,000        
Commercialization milestone payments   $ 30,000        
Basis point reduction           1.50%
Revenue recognized       $ 600   $ 1,700
Milestone payment received         10,000  
Collaborative Arrangement | Royalty revenue            
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]            
Revenue recognized         $ 200