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Fair Value Measurements - Assets Carried at Fair Value Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Jun. 30, 2012
Assets:
Cash equivalents	$ 8,845	$ 4,292
Marketable securities
Marketable securities	15,156	14,238
Corporate bonds
Marketable securities
Marketable securities	5,061	5,950
Commercial paper
Marketable securities
Marketable securities	1,250	3,046
Certificates of deposit
Marketable securities
Marketable securities		950
Quoted prices in active markets (Level 1)
Assets:
Cash equivalents	8,393	4,042
Marketable securities
Marketable securities	11,788	7,726
Quoted prices in active markets (Level 1) | Corporate bonds
Marketable securities
Marketable securities	3,395	3,684
Quoted prices in active markets (Level 1) | Commercial paper
Marketable securities
Marketable securities
Quoted prices in active markets (Level 1) | Certificates of deposit
Marketable securities
Marketable securities
Significant other observable inputs (Level 2)
Assets:
Cash equivalents	452	250
Marketable securities
Marketable securities	3,368	6,512
Significant other observable inputs (Level 2) | Corporate bonds
Marketable securities
Marketable securities	1,666	2,266
Significant other observable inputs (Level 2) | Commercial paper
Marketable securities
Marketable securities	1,250	3,046
Significant other observable inputs (Level 2) | Certificates of deposit
Marketable securities
Marketable securities		950
Significant unobservable inputs (Level 3)
Assets:
Cash equivalents
Marketable securities
Marketable securities
Significant unobservable inputs (Level 3) | Corporate bonds
Marketable securities
Marketable securities
Significant unobservable inputs (Level 3) | Commercial paper
Marketable securities
Marketable securities
Significant unobservable inputs (Level 3) | Certificates of deposit
Marketable securities
Marketable securities

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- Definition

Cash Equivalents Fair Value Disclosure

+ References

No definition available.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

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