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Commitments and Contingencies - Litigation (Details) - USD ($)
$ in Millions
1 Months Ended
Feb. 28, 2018
Feb. 27, 2018
Oct. 07, 2013
Feb. 28, 2018
Loss Contingencies [Line Items]        
Payment of legal settlement $ 4.5     $ 4.5
Amount of reimbursement of fees and portion of settlement.   $ 1.9    
Tails Inc.        
Loss Contingencies [Line Items]        
Cash consideration     $ 20.2