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Basis of Presentation - Change in Accounting Principle (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Change in Accounting Principle    
Retained Earnings (Accumulated Deficit) $ (61,906) $ (45,058)
ASU 2016-09 | Adjustments for New Accounting Principle, Early Adoption [Member]    
Change in Accounting Principle    
Retained Earnings (Accumulated Deficit) (1,300)  
Deferred Tax Assets, Net of Valuation Allowance $ 2,400