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Stockholders' Equity (Details Textual) (USD $) | 6 Months Ended |  |  | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Oct. 31, 2012 | Oct. 31, 2011 | Apr. 30, 2012 | Apr. 30, 2011 | Oct. 31, 2012 General and Administrative Expense [Member] | Oct. 31, 2012 General and Administrative Expense [Member] | Oct. 31, 2011 General and Administrative Expense [Member] | Oct. 31, 2012 Former President and Chief Executive Officer [Member] | Oct. 31, 2012 PSUs [Member] | Oct. 31, 2011 PSUs [Member] | Oct. 31, 2012 PSUs [Member] Executive Officer [Member] | Oct. 31, 2011 PSUs [Member] Executive Officer [Member] | Oct. 31, 2012 Restricted Stock Units (RSUs) [Member] | Oct. 31, 2011 Restricted Stock Units (RSUs) [Member] | Oct. 31, 2012 2004 Incentive Stock Plan [Member] | Oct. 31, 2012 Employee Stock Purchase Plan [Member] | Oct. 31, 2011 Employee Stock Purchase Plan [Member] | Oct. 31, 2011 Convertible Notes [Member] | Oct. 31, 2011 Convertible Notes [Member] | Oct. 31, 2012 Stock Options [Member] | Oct. 31, 2011 Stock Options [Member] | Oct. 31, 2012 Stock Options [Member] | Oct. 31, 2011 Stock Options [Member]
Stockholders' Equity (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common stock issuable with antidilutive effect |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,077,995 | 2,568,098 | 163,542 | 2,431,906 | 229,639 | 2,431,906
Percentage of common stock authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |
Authorized of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |
Period to award vested and calculate volatility rate | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |
Period of award vested exercisable |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Exercise price per share | $ 11.02 | $ 3.12 |  |  |  |  |  | $ 1.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option granted under ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 92,476 | 234,418 |  |  |  |  |  |
Option granted | 3,500 | 1,094,100 |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option outstanding | 3,051,660 | 3,902,832 | 3,988,164 | 3,137,565 |  |  |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expiration date of options outstanding |  |  |  |  |  |  |  | Dec. 06, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  |  | $ 2,000,000 | $ 1,100,000 |  |  | $ 143,000 |  |  | $ 643,000 |  |  |  |  |  |  |  |  |  |
Amount of cancelled PSU Excluded from compensation Expenses |  | 180,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of share based compensation delivered |  |  |  |  |  |  |  |  |  |  |  |  | 51,000 | 3,000 |  |  |  |  |  |  |  |  |
Share based compensation delivered |  |  |  |  |  |  |  |  |  |  |  |  | 7,667 | 1,000 |  |  |  |  |  |  |  |  |
Stock-based compensation expense related to the loss on sale of our discontinued operations | (798,000) |  |  |  | 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance-based restricted stock units granted in period |  |  |  |  |  |  |  |  |  |  | 34,800 | 95,200 | 55,250 | 0 |  |  |  |  |  |  |  |  |
Other than options cancelled in period |  |  |  |  |  |  |  |  | 35,000 | 88,700 |  |  | 12,331 |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  |  |  | 2,000,000 |  |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |
Stockholders Equity (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock vested | 15,800,000 | 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock exercisable | 9,800,000 | 938,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock exercised | 5,100,000 | 216,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized fair value of outstanding options | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized fair value options recognized remaining vesting period | 1 year 2 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of maximum aggregate award granted | 200.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of stock outperform in order for target award to be earned | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for cost expected to be recognized over a weighted average remaining contractual term | 1 year 8 months 12 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price per share | $ 11.02 | $ 3.12 |  |  |  |  |  | $ 1.47 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(b) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph b(1)(a) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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