Asset and liabilities fair value disclosure.

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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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph 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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8, 9

-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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7, 26

-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 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585

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-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7

-Footnote 1

-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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.1)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5

+ Details

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Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8

-Footnote 2

-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 Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7, 8, 9, 10

-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

-Glossary Cash

-URI http://asc.fasb.org/extlink&oid=6506951

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash Equivalents

-URI http://asc.fasb.org/extlink&oid=6507016

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 7

-Footnote 1

-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.

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 15

-Paragraph 83

-URI http://asc.fasb.org/extlink&oid=6913464&loc=d3e34841-113949

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 10

-Subparagraph i

-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.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 6

-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.

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- Details

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- Definition

This element represents the aggregate of the liabilities 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

+ Details

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Fair Value Measures (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Cash equivalents
Cash and cash equivalents	$ 96,407	$ 81,897	$ 59,805	$ 155,645
Available-for-sale Securities
Total available-for-sale securities	54,010	211,654
Fair value measurements, Recurring [Member]
Cash equivalents
Total cash equivalents	61,940	52,637
Available-for-sale Securities
Total available-for-sale securities	54,010	211,654
Total assets	115,950	264,291
Liabilities
Total liabilities	(10,951)
Total assets and liabilities at fair value	104,999
Fair value measurements, Recurring [Member] \| Warrant [Member]
Liabilities
Derivative instruments	(10,492)
Fair value measurements, Recurring [Member] \| Interest rate swap [Member]
Liabilities
Derivative instruments	(459)
Fair value measurements, Recurring [Member] \| U.S. government securities [Member]
Cash equivalents
Cash and cash equivalents	22,623
Available-for-sale Securities
Total available-for-sale securities	27,264	162,170
Fair value measurements, Recurring [Member] \| Money market and other funds [Member]
Cash equivalents
Cash and cash equivalents	24,201	32,637
Fair value measurements, Recurring [Member] \| Commercial paper [Member]
Cash equivalents
Cash and cash equivalents	10,074	20,000
Available-for-sale Securities
Total available-for-sale securities	4,595	49,484
Fair value measurements, Recurring [Member] \| Time deposits [Member]
Cash equivalents
Cash and cash equivalents	1,990
Available-for-sale Securities
Total available-for-sale securities	5,713
Fair value measurements, Recurring [Member] \| Taxable municipal bonds [Member]
Cash equivalents
Cash and cash equivalents	3,052
Available-for-sale Securities
Total available-for-sale securities	16,438
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member]
Cash equivalents
Total cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Total assets
Liabilities
Total liabilities
Total assets and liabilities at fair value
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| Warrant [Member]
Liabilities
Derivative instruments
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| Interest rate swap [Member]
Liabilities
Derivative instruments
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| U.S. government securities [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| Money market and other funds [Member]
Cash equivalents
Cash and cash equivalents
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| Commercial paper [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| Time deposits [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Quoted prices in active markets using identical assets (Level 1) [Member] \| Taxable municipal bonds [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member]
Cash equivalents
Total cash equivalents	61,940	52,637
Available-for-sale Securities
Total available-for-sale securities	54,010	211,654
Total assets	115,950	264,291
Liabilities
Total liabilities	(459)
Total assets and liabilities at fair value	115,491
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member] \| Interest rate swap [Member]
Liabilities
Derivative instruments	(459)
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member] \| U.S. government securities [Member]
Cash equivalents
Cash and cash equivalents	22,623
Available-for-sale Securities
Total available-for-sale securities	27,264	162,170
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member] \| Money market and other funds [Member]
Cash equivalents
Cash and cash equivalents	24,201	32,637
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member] \| Commercial paper [Member]
Cash equivalents
Cash and cash equivalents	10,074	20,000
Available-for-sale Securities
Total available-for-sale securities	4,595	49,484
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member] \| Time deposits [Member]
Cash equivalents
Cash and cash equivalents	1,990
Available-for-sale Securities
Total available-for-sale securities	5,713
Fair value measurements, Recurring [Member] \| Significant other observable inputs (Level 2) [Member] \| Taxable municipal bonds [Member]
Cash equivalents
Cash and cash equivalents	3,052
Available-for-sale Securities
Total available-for-sale securities	16,438
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member]
Cash equivalents
Total cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Total assets
Liabilities
Total liabilities	(10,492)
Total assets and liabilities at fair value	(10,492)
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member] \| Warrant [Member]
Liabilities
Derivative instruments	(10,492)
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member] \| U.S. government securities [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member] \| Money market and other funds [Member]
Cash equivalents
Cash and cash equivalents
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member] \| Commercial paper [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member] \| Time deposits [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities
Fair value measurements, Recurring [Member] \| Significant unobservable inputs (Level 3) [Member] \| Taxable municipal bonds [Member]
Cash equivalents
Cash and cash equivalents
Available-for-sale Securities
Total available-for-sale securities