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Income Taxes - Rollforward of uncertain tax positions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Balance at beginning of year $ 180 $ 180
Additions based on tax positions related to the current year 106 0
Reductions for tax positions of prior years 0 0
Balance at end of year $ 286 $ 180