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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2011
Schedule Of Income Taxes [Line Items] |  |  |
State net operating carry forwards | $ 39,800,000 |  |
Expiration period for net operating loss carry forwards | 2013 through 2033 |  |
Research and development credit carry forwards | 4,171,000 | 3,688,000 |
Expiration period for credit carry forwards | 2016 through 2033 |  |
Net operating loss carryforwards | 68,141,000 | 73,087,000 |
Net change in valuation allowance | 5,000,000 | 924,000 | 670,000
Unrecognized Deferred tax liabilities | 4,500,000 |  |
Unrecognized tax benefit amount, if recognized | 394,000 | 394,000 | 0
Federal |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Federal net operating carry forwards | 193,900,000 |  |
Federal Research And Development Credits |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Research and development credit carry forwards | 2,200,000 |  |
California |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Research and development credit carry forwards | 3,000,000 |  |
U K Operating Credits |  |  |
Schedule Of Income Taxes [Line Items] |  |  |
Net operating loss carryforwards | $ 6,900,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Section Appendix E -Paragraph 289 -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 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 + Details
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