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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2012
Income Taxes [Abstract] |
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
| As of December 31,
| 2012 |  | 2011
| (in thousands)
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ | 216,579 |  |  | $ | 195,810 |
Research and development tax credits | 32,066 |  |  | 34,611 |
Capitalized research and development | 71,839 |  |  | 60,938 |
Stock-based compensation | 12,972 |  |  | 11,843 |
Deferred revenue | 4,906 |  |  | 5,008 |
Other | 10,429 |  |  | 7,126 |
Total deferred tax assets | 348,791 |  |  | 315,336 |
Deferred tax liabilities: |  |  |
Deferred tax liability related to acquisition of Symphony Icon | (18,745 | ) |  | (18,745 | )
Other | (340 | ) |  | (343 | )
Total deferred tax liabilities | (19,085 | ) |  | (19,088 | )
Less: valuation allowance | (348,451 | ) |  | (314,993 | )
Net deferred tax liabilities | $ | (18,745 | ) |  | $ | (18,745 | )

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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