Net Loss Per Share Applicable to Common Stockholders - Computations of Loss per Share Applicable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands |
3 Months Ended | 9 Months Ended | |||||
|---|---|---|---|---|---|---|---|
Jan. 31, 2016 |
Jan. 31, 2015 |
Jan. 31, 2016 |
Jan. 31, 2015 |
||||
| Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items] | |||||||
| Net loss from continuing operations | $ (3,114) | $ (4,123) | $ (18,210) | $ (24,339) | |||
| Net loss from discontinued operations, net of tax | 0 | 0 | 0 | (1,257) | |||
| Net loss applicable to common stockholders | $ (3,114) | $ (4,123) | $ (18,210) | $ (25,596) | |||
| Continuing operations | $ (0.04) | $ (0.05) | $ (0.23) | $ (0.31) | |||
| Discontinued operations | 0.00 | 0.00 | 0.00 | (0.02) | |||
| Basic and diluted loss per share: | $ (0.04) | $ (0.05) | $ (0.23) | $ (0.33) | |||
| Basic and diluted weighted average number of shares outstanding | 81,096 | 78,898 | 80,649 | 78,315 | |||
| Outstanding stock options | |||||||
| Potentially dilutive securities (1): | |||||||
| Outstanding stock options | [1] | 168 | 721 | 224 | 817 | ||
| Restricted shares | |||||||
| Potentially dilutive securities (1): | |||||||
| Outstanding stock options | [1] | 17 | 629 | 50 | 404 | ||
| |||||||
| X | ||||||||||
- Definition Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items] No definition available.
|
| X | ||||||||||
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. No definition available.
|
| X | ||||||||||
- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. No definition available.
|
| X | ||||||||||
- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Per basic and diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation, when the per share amount is the same. No definition available.
|
| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|