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Summary of Significant Accounting Policies - Schedule of New Accounting Pronouncements and Changes in Accounting Principles (Details) - Accounting Standards Update 2016-01 - USD ($) $ in Thousands		Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings	[1]		$ 1,635
Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings		$ 3,295	$ 3,295	[1]
Equity securities which were previously classified as available-for-sale | Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings		1,660
Equity securities which were previously accounted for under the cost method | Retained Earnings (Accumulated Deficit)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment to retained earnings		$ 1,635
[1] See Note 2 for further information about adjustments resulting from the Company’s adoption of new accounting standards in 2018.

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