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Fair Value Measurements | 3 Months Ended
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Dec. 31, 2014
Fair Value Disclosures [Abstract] |
Fair Value Measurements | Fair Value Measurements The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities and Level 3, defined as unobservable inputs that are not corroborated by market data. Any transfers of investments between levels occurs at the end of the reporting period. Assets measured or disclosed at fair value on a recurring basis consisted of the following:
|  |  |  | Fair Value Measurements Using
|  | December 31, 2014 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Money market funds |  | $ | 16,356 |  |  | $ | 16,356 |  |  | $ | — |  |  | $ | — |
Corporate bonds |  | 22,276 |  |  | 22,276 |  |  | — |  |  | — |
Municipal bonds |  | 30,705 |  |  | — |  |  | 30,705 |  |  | — |
Commercial paper |  | 6,751 |  |  | — |  |  | 6,751 |  |  | — |
Certificates of deposit |  | 5,216 |  |  | — |  |  | 5,216 |  |  | — |
Total assets at fair value on a recurring basis |  | $ | 81,304 |  |  | $ | 38,632 |  |  | $ | 42,672 |  |  | $ | — |
|  |  |  | Fair Value Measurements Using
|  | September 30, 2014 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Money market funds |  | $ | 29,995 |  |  | $ | 29,995 |  |  | $ | — |  |  | $ | — |
Corporate bonds |  | 20,854 |  |  | 20,854 |  |  | — |  |  | — |
Municipal bonds |  | 31,151 |  |  | — |  |  | 31,151 |  |  | — |
Certificates of deposit |  | 5,149 |  |  | — |  |  | 5,149 |  |  | — |
Total assets at fair value on a recurring basis |  | $ | 87,149 |  |  | $ | 50,849 |  |  | $ | 36,300 |  |  | $ | — |
Our Level 2 investments are valued using readily available pricing sources which utilize market observable inputs, including the current interest rate for similar types of instruments.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13504-108611 + Details
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