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REVENUE RECOGNITION (Tables)
 6 Months Ended
Jun. 30, 2020
Revenue from Contract with Customer [Abstract]  
Summary of net product revenue
The following table summarizes net product revenues for the three and six months ended June 30, 2020 and 2019 (in thousands):
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Bile acid products$21,573  $20,929  $43,854  $39,319  
Tiopronin products26,857  23,778  52,345  44,958  
Total net product revenue$48,430  $44,707  $96,199  $84,277