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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 04, 2013
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 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)         383,887    
Stock-based compensation         $ 2,976 $ 3,051  
Selling, general and administrative expenses              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation costs charged to operations   $ 800   $ 1,000      
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)   172,377     172,377    
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)   7,524,531     7,524,531    
ISO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grants of ISO and non-qualified stock options (in shares)   8,718     184,752    
NQO              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Grants of ISO and non-qualified stock options (in shares)   142     199,135    
Restricted Stock Units (RSUs)              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Granted (shares)   2,746     106,609    
Fair value of units on grant date         $ 2,500    
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     $ 800        
Award holding restriction period         3 years