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Roll Forward of Unrecognized Tax Benefits and Associated Interest and Penalties Included in Balance Sheet (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions   $ (655)
Balance $ 5,140 4,448
Increase in current year tax positions 320  
Balance 4,359 5,140
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations   291
Gross Unrecognized Tax Benefits, Excluding Interest and Penalties    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions   (619)
Balance 4,903 4,227
Increase in current year tax positions 320  
Balance 4,074 4,903
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations   291
Interest and Penalties    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions   (36)
Balance 237 221
Increase in current year tax positions 0  
Balance $ 285 237
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations   $ 0