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Debt - Additional Information (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 08, 2016
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                
Drawn amount           $ 0 $ 0 $ 100,000,000
Unamortized issue discount           0 282,000  
Cash and cash equivalents           131,920,000 $ 23,275,000  
Credit Facility                
Debt Instrument [Line Items]                
Outstanding borrowings           0    
Outstanding letters of credit           200,000    
Maximum | Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, principal amount $ 50,000,000.0   $ 50,000,000.0     $ 50,000,000.0    
Loan Agreement | Prior Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Drawn amount 0              
Unamortized term loan issuance fees 0   0          
Accrued commitment fees $ 100,000              
Amortized loan issuance fees     700,000          
Loan Agreement | Selling, General and Administrative Expenses | Prior Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Amortized loan issuance fees     500,000          
Loan Agreement | Interest Expense, Net | Prior Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Amortized loan issuance fees     $ 200,000          
Loan Agreement | Credit Facility                
Debt Instrument [Line Items]                
Debt instrument, basis points 1.00%              
Debt instrument, term 364 days              
Prior Senior Secured Credit Agreement                
Debt Instrument [Line Items]                
Description of variable interest rate basis           Borrowings under the Prior Senior Secured Credit Facilities bore interest at a rate equal to, at our option, either (i) the adjusted Eurocurrency rate based on LIBOR for U.S. dollar deposits for loans denominated in dollars, EURIBOR for Euro deposits for loans denominated in Euros and the offer rate for any other currencies for loans denominated in such other currencies for the relevant interest period plus an applicable margin from 1.25% to 2.25% based on the total net leverage ratio from less than 1.50:1.00 to greater than 3.75:1:00, or (ii) an alternative base rate (determined by reference to the highest of (a) the prime commercial lending rate of the administrative agent, as established from time to time, (b) the Federal Funds Rate plus 0.50% and (c) the one-month adjusted Eurocurrency rate for loans in U.S. dollars plus 1.00%) plus an applicable margin from 0.25% to 1.25% based on the total net leverage ratio from less than 1.50:1.00 to greater than 3.75:1:00.  The applicable margin as of December 31, 2018 was 1.25% for eurocurrency loans and 0.25% for base rate loans.    
Ratio of consolidated funded indebtedness to consolidated EBITDA             4.00  
Prior Senior Secured Credit Agreement | Eurocurrency Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             1.25%  
Prior Senior Secured Credit Agreement | Federal Funds Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             0.50%  
Prior Senior Secured Credit Agreement | One-Month Adjusted Eurocurrency Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             1.00%  
Prior Senior Secured Credit Agreement | Base Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             0.25%  
Prior Senior Secured Credit Agreement | Prior Senior Secured Revolving Credit Facility                
Debt Instrument [Line Items]                
Outstanding borrowings             $ 0  
Outstanding letters of credit             $ 200,000  
Maximum borrowing capacity   $ 150,000,000.0            
Expiration date   2021-12            
Commitment fee percentage         0.375%      
Total net leverage ratio limit to determine commitment fee             3.00  
Undrawn capacity             $ 149,800,000  
Prior Senior Secured Credit Agreement | Prior Senior Secured Revolving Credit Facility | Prior Senior Secured Credit Facilities - Scenario 1                
Debt Instrument [Line Items]                
Commitment fee percentage             0.50%  
Prior Senior Secured Credit Agreement | Prior Senior Secured Revolving Credit Facility | Prior Senior Secured Credit Facilities - Scenario 2                
Debt Instrument [Line Items]                
Commitment fee percentage             0.375%  
Prior Senior Secured Credit Agreement | Prior Senior Secured Revolving Credit Facility | Eurocurrency Rate                
Debt Instrument [Line Items]                
Interest rate applicable             3.77%  
Prior Senior Secured Credit Agreement | Minimum | Eurocurrency Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             1.25%  
Debt instrument, total net leverage ratio             3.75  
Prior Senior Secured Credit Agreement | Minimum | Base Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             0.25%  
Debt instrument, total net leverage ratio             3.75  
Prior Senior Secured Credit Agreement | Maximum                
Debt Instrument [Line Items]                
Ratio of consolidated funded indebtedness to consolidated EBITDA             4.50  
Cash consideration             $ 25,000,000  
Ratio of consolidated EBITDA to consolidated interest expense             3.00  
Prior Senior Secured Credit Agreement | Maximum | Unrestricted                
Debt Instrument [Line Items]                
Cash and cash equivalents             $ 50,000,000  
Prior Senior Secured Credit Agreement | Maximum | Foreign | Unrestricted                
Debt Instrument [Line Items]                
Cash and cash equivalents             $ 25,000,000  
Prior Senior Secured Credit Agreement | Maximum | Eurocurrency Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             2.25%  
Debt instrument, total net leverage ratio             1.50  
Prior Senior Secured Credit Agreement | Maximum | Base Rate                
Debt Instrument [Line Items]                
Debt instrument, basis points             1.25%  
Debt instrument, total net leverage ratio             1.50  
Prior Senior Secured Credit Agreement | Prior Senior Secured Term Loan Facility                
Debt Instrument [Line Items]                
Unamortized term loan issuance fees   $ 800,000         $ 400,000  
Maximum borrowing capacity   $ 165,000,000.0            
Debt instrument percentage of face value issued   99.70%            
Expiration date   2021-12            
Unamortized issue discount   $ 500,000         $ 300,000  
Prior Senior Secured Credit Agreement | Prior Senior Secured Term Loan Facility | Selling, General and Administrative Expenses                
Debt Instrument [Line Items]                
Unamortized term loan issuance fees       $ 300,000        
Prior Senior Secured Credit Agreement | Prior Senior Secured Term Loan Facility | Interest Expense, Net                
Debt Instrument [Line Items]                
Amortization of debt discount       $ 200,000        
Prior Senior Secured Credit Agreement | Term Loan                
Debt Instrument [Line Items]                
Interest rate applicable             3.77%  
Prior Senior Secured Credit Agreement | Prior Senior Secured Revolving Credit Facility                
Debt Instrument [Line Items]                
Unamortized term loan issuance fees   $ 1,600,000         $ 900,000