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Inventories, net (Tables)
9 Months Ended
Oct. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory
   

October 31,

2018

   

January 31,

2018

 
             
Raw materials   $ 16,020     $ 14,767  
Work-in-process     1,750       2,357  
Finished goods     28,850       25,795  
    $ 46,620     $ 42,919