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Summary of Significant Accounting Policies, Recent Accounting Pronouncements (Details) - Accounting Standards Update 2016-09 [Member] $ in Thousands	Dec. 31, 2016 USD ($)
Accounting Pronouncements [Abstract]
Cumulative adjustment	$ 0
Retained Earnings [Member]
Accounting Pronouncements [Abstract]
Cumulative adjustment	(2,800)
Additional Paid-in Capital [Member]
Accounting Pronouncements [Abstract]
Cumulative adjustment	$ 2,800

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