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Commitments and Contingencies - Line of Credit (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Debt Instrument [Line Items]  
Line of credit facility, maximum borrowing capacity $ 10
Line of credit facility, interest rate during period 5.00%
Prime Rate  
Debt Instrument [Line Items]  
Basis spread on variable rate 1.00%