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Stockholders' Equity - Restricted Stock Units (Details) - Restricted stock units
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Jun. 30, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares of common stock entitled for each unit upon vesting | item 1  
Vesting period (in years) 1 year  
Granted (in shares) | shares 17,820  
Awards granted during the period, weighted average grant date fair value (in dollars per share) | $ / shares $ 132.30  
Aggregate grant date fair value $ 2.4  
Unrecognized compensation cost $ 2.3  
Weighted average remaining vesting period (in years) 1 year  
Selling, general and administrative    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense before taxes $ 1.0 $ 0.1