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Debt - Previous Credit Agreement (Details) - USD ($)
$ in Thousands
6 Months Ended
May 08, 2017
Oct. 31, 2014
Jun. 30, 2018
Jun. 30, 2017
Mar. 20, 2017
Nov. 17, 2015
Debt Instrument [Line Items]            
Proceeds from term loans     $ 0 $ 18,000    
Term Loan            
Debt Instrument [Line Items]            
Principal $ 20,000          
Proceeds from term loans 18,000          
Debt discount on term loan 2,000          
Debt issuance costs $ 400          
Revolving Credit Facility            
Debt Instrument [Line Items]            
Term of debt instrument   5 years        
Maximum amount of credit facility   $ 25,000     $ 10,000 $ 48,000