SUPPLEMENTAL CONDENSED CONSOLIDATED FINANCIAL STATEMENT INFORMATION - INVENTORIES (Details) - USD ($) $ in Thousands |
Apr. 30, 2018 |
Jan. 31, 2018 |
|---|---|---|
| Inventories | ||
| Raw materials | $ 8,615 | $ 9,870 |
| Work-in-process | 6,459 | 6,269 |
| Finished goods | 2,880 | 3,732 |
| Total inventories | $ 17,954 | $ 19,871 |