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Provision for Income Taxes | 12 Months Ended
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Apr. 30, 2016
Income Tax Disclosure [Abstract] |
Provision for Income Taxes | Provision for Income Taxes The components of the provision (benefit) for income taxes are as follows (in thousands):
| Year Ended April 30, 2016
| Federal |  | State |  | Foreign |  | Total
Current | $ | — |  |  | $ | — |  |  | $ | 92 |  |  | $ | 92 |
Deferred | (3,322 | ) |  | (537 | ) |  | 11 |  |  | (3,848 | )
Change in valuation allowance | 3,322 |  |  | 537 |  |  | (11 | ) |  | 3,848 |
Total | $ | — |  |  | $ | — |  |  | $ | 92 |  |  | $ | 92 |
| Year Ended April 30, 2015
| Federal * |  | State * |  | Foreign |  | Total
Current | $ | — |  |  | $ | 3 |  |  | $ | 124 |  |  | $ | 127 |
Deferred | (3,912 | ) |  | (287 | ) |  | 8 |  |  | (4,191 | )
Change in valuation allowance | 3,912 |  |  | 287 |  |  | (8 | ) |  | 4,191 |
Total | $ | — |  |  | $ | 3 |  |  | $ | 124 |  |  | $ | 127 |
* The deferred and change in valuation allowance amounts for federal and state in the table above relating to the year ended April 30, 2015 were incorrectly presented in the previous filed 10-K on July 29, 2015 and have since been corrected herein. The incorrect disclosure had no impact on the total income tax expense or any other account balances of the Company's consolidated financial statements at April 30, 2015. A reconciliation between the Company’s effective tax rate and the United States statutory tax rate for the years ended April 30, 2016 and 2015 is as follows:
| Year Ended April 30,
| 2016 |  | 2015
Federal income tax at statutory rate | 34.0 | % |  | 34.0 | %
State income tax, net of federal benefit | 3.1 |  |  | 2.6 |
Permanent differences | (0.2 | ) |  | 0.9 |
Increase in uncertain tax position | (0.6 | ) |  | (0.8 | )
Other | (2.2 | ) |  | (6.9 | )
Change in valuation allowance | (37.2 | ) |  | (30.8 | )
Changes in tax rates | 2.2 |  |  | — |
Income tax expense | (0.9 | )% |  | (1.0 | )%
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company’s deferred tax assets and liabilities as of April 30, 2016 and 2015 consist of the following (in thousands):
| As of April 30,
| 2016 |  | 2015
Accrued liabilities | $ | 21 |  |  | $ | 21 |
State taxes | 12 |  |  | 1 |
Stock-based compensation expense | 5,528 |  |  | 4,803 |
Capitalized research and development costs | 316 |  |  | 433 |
Foreign net operating loss carry-forward | 224 |  |  | 235 |
Net operating loss carry-forward | 12,970 |  |  | 9,719 |
Total deferred tax assets | 19,071 |  |  | 15,212 |
Less: Valuation allowance | (19,071 | ) |  | (15,212 | )
Net deferred tax asset | $ | — |  |  | $ | — |
Management has evaluated the available evidence about future tax planning strategies, taxable income and other possible sources of realization of deferred tax assets and has established a full valuation allowance against its net deferred tax assets as of April 30, 2016 and 2015. For the years ended April 30, 2016 and 2015, the Company recorded a valuation allowance of $19.1 million and $15.2 million, respectively. As of April 30, 2016 and 2015, the Company’s estimated U.S. net operating loss carry-forwards were approximately $36 million and $26 million, respectively, which will begin expiring in 2022 for federal and 2017 for state purposes. As of April 30, 2016 and 2015, the Company’s foreign net operating loss carry-forward was approximately $900,000 and $1 million, respectively, which have an unlimited carryforward period. A valuation allowance has been recorded against all of these losses due to continued overall losses. The Company may be subject to the net operating loss provisions of Section 382 of the Internal Revenue Code. Due to the company's funding transaction, the company may have triggered a net operating loss limitation under Internal Revenue Code §382. The company has not calculated if an ownership change has occurred. The effect of an ownership change would be the imposition of an annual limitation on the use of NOL carryforwards attributable to periods before the change. The amount of the annual limitation depends upon the value of the Company immediately before the change, changes to the Company’s capital during a specified period, and the federal published interest rate. The Company has made no provision for U.S. taxes on the cumulative earnings of foreign subsidiaries as those earnings are intended to be reinvested for an indefinite period of time. Upon distribution of these earnings in the form of dividends or otherwise, the Company may be subject to U.S. income taxes and foreign withholding taxes. It is not practical, however, to estimate the amount of taxes that may be payable on the eventual repatriation of these earnings. The Company files income tax returns in various jurisdictions with varying statues of limitations. As of April 30, 2016, the earliest tax year still subject to examination for state purposes is fiscal 2013. The Company’s tax years for periods ending April 30, 2001 and forward are subject to examination by the United States and certain states due to the carry-forward of unutilized net operating losses. The following table indicates the changes to the Company’s uncertain tax positions for the period and years ended April 30, 2016 and 2015 in thousands:
| Year Ended April 30,
| 2016 |  | 2015
Balance, beginning of the year | $ | 100 |  |  | $ | — |
Addition based on tax positions related to prior years | 42 |  |  | 21 |
Addition based on tax positions related to current year | 23 |  |  | 79 |
Balance, end of year | $ | 165 |  |  | $ | 100 |
As of April 30, 2016 the above amount of $165,000 was included in other long-term liabilities.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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