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Disclosure - Stockholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Stock-Based Compensation (Tables) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Net Loss Per Share Attributable to Common Stockholders (Tables) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - Summary of Significant Accounting Policies - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - Summary of Significant Accounting Policies - Useful Lives (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - Fair Value Measurements - Contractual Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - Property and Equipment - Schedule of Property and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 0000055 - Disclosure - Property and Equipment - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000056 - Disclosure - Impairment (Details) link:presentationLink link:calculationLink link:definitionLink 0000057 - Disclosure - Restructuring Activities - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000058 - Disclosure - Restructuring Activities - Schedule of Restructuring Activities (Details) link:presentationLink link:calculationLink link:definitionLink 0000059 - Disclosure - Derivatives and Hedging - 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