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Inventory
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventory Inventory
Inventory, which consists of commercial supply of TIBSOVO® (ivosidenib), consists of the following (in thousands):
March 31,
2019
December 31,
2018
Raw materials$— $— 
Work-in-process2,267 788 
Finished goods61 81 
Total inventory$2,328 $869