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Debt (Details) - Term Loan - Secured Debt - Variable Interest Rate Term Loan Maturing August 2022 - USD ($)
$ in Millions
Aug. 15, 2017
Mar. 31, 2018
Jan. 12, 2018
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 30.0    
Debt instrument, term 5 years    
Amount outstanding   $ 13.2 $ 13.2
Minimum | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.75%    
Maximum | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.25%