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Credit Facility (Details) - Line of credit
1 Months Ended
Sep. 30, 2018
Nov. 30, 2016
USD ($)
Sep. 30, 2019
USD ($)
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Debt instrument term (in years)   3 years  
Maximum borrowing capacity   $ 25,000,000.0  
Debt covenant, net cash equals or exceeds, amount   50,000,000  
Debt covenant, net cash falls below, amount   $ 50,000,000  
Unused capacity commitment fee   0.40%  
Minimum adjusted quick ratio under debt compliance   1.50  
Amount outstanding     $ 0
Amended Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Unused capacity commitment fee 0.30%    
Letter of Credit      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity   $ 25,000,000.0  
Prime Rate | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Variable rate basis spread   0.50%  
LIBOR | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Variable rate basis spread   2.50%