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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - Accounting Standards Update 2016-09 [Member] $ in Thousands	Jan. 01, 2016 USD ($)
Retained earnings
Cumulative effect of adoption	$ (148)
Additional paid-in capital
Cumulative effect of adoption	$ 238

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

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