Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Apr. 30, 2017 |
Jan. 31, 2017 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Allowance for doubtful accounts receivable | $ 876 | $ 876 |
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 100,000,000 | 100,000,000 |
| Common stock, shares issued | 35,368,973 | 35,339,232 |
| Common stock, shares outstanding | 35,328,483 | 35,298,742 |
| Treasury stock, common shares | 40,490 | 40,490 |