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Inventories (Details) - USD ($)
$ in Thousands
Jul. 31, 2021
Jan. 31, 2021
Inventories    
Raw materials $ 17,892 $ 18,941
Work-in-process 1,038 409
Finished goods 30,817 27,047
Excess and obsolete reserves (2,774) (2,564)
Inventories, net $ 46,973 $ 43,833