Summary of Significant Accounting Policies (Policies)	9 Months Ended
Summary of Significant Accounting Policies (Policies)	Sep. 30, 2014
Accounting Policies [Abstract]
Basis of Presentation	*Basis of Presentation* The accompanying Financial Statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC) for Quarterly Reports on Form 10-Q and do not include all of the information and note disclosures required by the accounting principles generally accepted in the United States of America (U.S. GAAP) for complete financial statements. The Financial Statements should therefore be read in conjunction with the Financial Statements and Notes thereto for the fiscal year ended December 31, 2013 included in the Company’s Annual Report on Form 10-K filed with the SEC on March 3, 2014. The accompanying Financial Statements have been prepared in accordance with U.S. GAAP, which requires management to make estimates and assumptions that affect amounts reported in the Financial Statements and accompanying disclosures. Although these estimates are based on the information reasonably available and actions that the Company may undertake in the future, actual results may be different from those estimates. The Financial Statements reflect all adjustments of a normal, recurring nature that are, in the opinion of management, necessary for a fair statement of results for these interim periods. The results of operations for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2014.
Principles of Consolidation	*Principles of Consolidation* The Company’s consolidated financial statements include the accounts of Synageva and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Significant Accounting Policies	*Significant Accounting Policies* There have been no material changes to the Company’s significant accounting policies during the three and nine months ended September 30, 2014, as compared to the significant accounting policies disclosed in Note 2, Summary of Significant Accounting Policies, of the Company’s financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2013.
Recent Accounting Pronouncements	*Recent Accounting Pronouncements* In July 2013, the Financial Accounting Standards Board issued an accounting standards update clarifying the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The updated guidance requires the netting of unrecognized tax benefits against a deferred tax asset for a loss or other carryforward when settlement of the liability for an unrecognized tax benefit in this manner is available. The update is effective prospectively for reporting periods beginning after December 15, 2013, and early adoption and retrospective adoption are permitted. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements or disclosures.

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

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