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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Recent Accounting Pronouncements          
Unrecognized tax benefits         $ 108
Income tax expense $ 165 $ 139 $ 260 $ 175  
Accounting Standards Update 2016-09 | Adjustment          
Recent Accounting Pronouncements          
Excess tax benefits offset with valuation allowance     8,118    
Income tax expense     $ 0