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Inventories, net (Tables)
6 Months Ended
Jul. 31, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory
    July 31, 2018     January 31, 2018  
             
Raw materials   $ 14,121     $ 14,767  
Work-in-process     1,831       2,357  
Finished goods     30,406       25,795  
    $ 46,358     $ 42,919