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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2013
Income Taxes [Abstract] |
Schedule of Deferred Tax Assets and Liabilities |
| As of December 31,
| 2013 |  | 2012
| (in thousands)
Deferred tax assets: |  |  |
Net operating loss carryforwards | $ | 238,608 |  |  | $ | 216,579 |
Research and development tax credits | 37,453 |  |  | 32,066 |
Capitalized research and development | 83,375 |  |  | 71,839 |
Stock-based compensation | 7,703 |  |  | 12,972 |
Deferred revenue | 4,760 |  |  | 4,906 |
Other | 4,712 |  |  | 10,429 |
Total deferred tax assets | 376,611 |  |  | 348,791 |
Deferred tax liabilities: |  |  |
Deferred tax liability related to acquisition of Symphony Icon | (18,745 | ) |  | (18,745 | )
Other | — |  |  | (340 | )
Total deferred tax liabilities | (18,745 | ) |  | (19,085 | )
Less: valuation allowance | (376,611 | ) |  | (348,451 | )
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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