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REVENUE RECOGNITION (Tables)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Summary of Net Product Revenue
The following table summarizes net product sales for the twelve months ended December 31, 2021, 2020 and 2019 (in thousands):
Twelve Months Ended December 31,
202120202019
Tiopronin products$115,122 $108,883 $95,638 
Bile acid products95,654 89,438 79,700 
Total net product revenue$210,776 $198,321 $175,338