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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
Fair Value, by Balance Sheet Grouping [Table Text Block] |
| Assets and Liabilities at Fair Value
| As of December 31, 2012
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 30,423 |  |  | $ | — |  |  | $ | — |  |  | $ | 30,423 |
Short-term investments | 192,785 |  |  | — |  |  | — |  |  | 192,785 |
Total cash and cash equivalents and investments | $ | 223,208 |  |  | $ | — |  |  | $ | — |  |  | $ | 223,208 |
Liabilities |  |  |  |  |  |  |
Other long-term liabilities | $ | — |  |  | $ | — |  |  | $ | 29,920 |  |  | $ | 29,920 |
Total liabilities | $ | — |  |  | $ | — |  |  | $ | 29,920 |  |  | $ | 29,920 |
| Assets and Liabilities at Fair Value
| As of December 31, 2011
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| (in thousands)
Assets |  |  |  |  |  |  |
Cash and cash equivalents | $ | 186,309 |  |  | $ | — |  |  | $ | — |  |  | $ | 186,309 |
Short-term investments | 95,383 |  |  | — |  |  | — |  |  | 95,383 |
Total cash and cash equivalents and investments | $ | 281,692 |  |  | $ | — |  |  | $ | — |  |  | $ | 281,692 |
Liabilities |  |  |  |  |  |  |
Other long-term liabilities | $ | — |  |  | $ | — |  |  | $ | 55,033 |  |  | $ | 55,033 |
Total liabilities | $ | — |  |  | $ | — |  |  | $ | 55,033 |  |  | $ | 55,033 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| Short-term Investments
| (in thousands)
Balance at December 31, 2009 | $ | 56,034 |
Unrealized gains included in earnings as gain on investments, net | 141 |
Net sales and settlements | (56,175 | )
Balance at December 31, 2010 | $ | — |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| Other Long-term Liabilities
| (in thousands)
Balance at December 31, 2009 | $ | — |
Purchase consideration liability resulting from the Symphony Icon acquisition | 45,557 |
Change in valuation of purchase consideration payable to former Symphony Icon stockholders | 2,710 |
Balance at December 31, 2010 | 48,267 |
Change in valuation of purchase consideration payable to former Symphony Icon stockholders | 6,766 |
Balance at December 31, 2011 | 55,033 |
Change in valuation of purchase consideration payable to former Symphony Icon stockholders | 9,887 |
Payment of base payment obligation with common stock | (35,000 | )
Balance at December 31, 2012 | $ | 29,920 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + 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 (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -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. + Details
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- Definition Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 14 -Subparagraph a -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 159 -Paragraph 18 -Subparagraph c(2), d, e, f -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 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15 -Subparagraph b-d -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 -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13467-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 19 -Subparagraph a, b, c(1), d(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. Reference 7: 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 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph a, c(1), c(2), c(3), d -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 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 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13476-108611 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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