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Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 2304301 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 2405401 - Disclosure - Summary of Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 2106103 - Disclosure - Available-for-Sale-Securities link:presentationLink link:calculationLink link:definitionLink 2307302 - Disclosure - Available-for-Sale-Securities (Tables) link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Available-for-Sale-Securities - Summary (Details) link:presentationLink link:calculationLink link:definitionLink 2409403 - Disclosure - Available-for-Sale-Securities - Classification on Consolidated Balance Sheets (Details) link:presentationLink link:calculationLink link:definitionLink 2410404 - Disclosure - Available-for-Sale-Securities - Contractual Maturities (Details) link:presentationLink link:calculationLink link:definitionLink 2111104 - Disclosure - Property and Equipment link:presentationLink link:calculationLink link:definitionLink 2312303 - Disclosure - Property and Equipment (Tables) link:presentationLink link:calculationLink link:definitionLink 2413405 - Disclosure - Property and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 2114105 - Disclosure - Loss Per Share link:presentationLink link:calculationLink link:definitionLink 2315304 - Disclosure - Loss Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2416406 - Disclosure - Loss Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 2117106 - Disclosure - Fair Value Measurements link:presentationLink link:calculationLink link:definitionLink 2318305 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2419407 - 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Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 2343310 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 2444421 - Disclosure - Income Taxes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2445422 - Disclosure - Income Taxes - Loss from Operations Before Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2446423 - Disclosure - Income Taxes - Components of Benefit from Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2447424 - Disclosure - Income Taxes - Effective Income Tax Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 2448425 - Disclosure - Income Taxes - Components of Deferred Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2149113 - Disclosure - Contingencies link:presentationLink link:calculationLink link:definitionLink 2150114 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 2451426 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink