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Disclosure - Cash Equivalents and Marketable Securities - Schedule of Fair Value and Amortized Cost of Cash Equivalents and Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Cash Equivalents and Marketable Securities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Other Investments (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Fair Value Measurements - Summary of Estimated Fair Value of Success Payment Liability Assumptions (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - 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