Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions - Remy W. Trafelet, Henry R. Slack and George R. Brokaw (Details)

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Related Party Transactions - Remy W. Trafelet, Henry R. Slack and George R. Brokaw (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2016
Dec. 31, 2017
Related Party Transaction [Line Items]    
Period of consecutive trading days 20 days  
Period following an executive's termination of employment for a number of reasons 18 months  
Period equivalent to severance cost payment 18 months  
Period of post-termination noncompetition and customer and employee nonsolicitation covenants 12 months  
Remy W. Trafelet    
Related Party Transaction [Line Items]    
Annual base salary   $ 400
Payment to executives in cash   400
Options granted in period (in shares) 300,000  
Period equivalent to severance cost payment 24 months  
Henry R. Slack    
Related Party Transaction [Line Items]    
Annual base salary   250
Payment to executives in cash   250
Options granted in period (in shares) 225,000  
George R. Brokaw    
Related Party Transaction [Line Items]    
Annual base salary   250
Payment to executives in cash   $ 250
Options granted in period (in shares) 225,000  
Period equivalent to severance cost payment 18 months  
Tranche One    
Related Party Transaction [Line Items]    
Percentage of options 25.00%  
Amount per share (in dollars per share) $ 60.00  
Tranche Two    
Related Party Transaction [Line Items]    
Percentage of options 25.00%  
Amount per share (in dollars per share) $ 75.00  
Tranche Three    
Related Party Transaction [Line Items]    
Percentage of options 25.00%  
Amount per share (in dollars per share) $ 90.00  
Tranche Four    
Related Party Transaction [Line Items]    
Percentage of options 25.00%  
Amount per share (in dollars per share) $ 105.00