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Inventories, net (Tables)
3 Months Ended
Apr. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of inventory
   

April 30,

2019

   

January 31,

2019

 
             
Raw materials   $ 18,070     $ 14,986  
Work-in-process     1,694       987  
Finished goods     26,997       26,392  
    $ 46,761     $ 42,365