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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 04, 2013
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Jul. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grants of ISO and non-qualified stock options (in shares)   0     375,027    
Selling, general and administrative expenses              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation costs charged to operations   $ 0.8   $ 1.6 $ 2.1 $ 2.1  
Amended Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase in the maximum number of shares available under the Plan (in shares) 210,000            
New maximum number of shares available under the Plan (in shares) 14,242,061            
Number of shares reserved under the Plan (in shares)   5,230,642     5,230,642    
Maximum number of shares available for grant under the Plan (in shares)   136,527     136,527    
2015 Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
New maximum number of shares available under the Plan (in shares)             8,400,000
Maximum number of shares available for grant under the Plan (in shares)   7,518,359     7,518,359    
ISO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grants of ISO and non-qualified stock options (in shares)     176,034        
NQO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grants of ISO and non-qualified stock options (in shares)     198,993        
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)   0 103,863   103,863    
Fair value of units on grant date         $ 2.4    
Award vesting period         3 years    
Restricted Stock Award (RSAs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)   0 35,430   35,430    
Fair value of awards granted     $ 0.8        
Award holding restriction period   3 years     3 years