Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details)

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Commitments and Contingencies (Details) - Unfavorable Regulatory Action - Pending Litigation - action
Jun. 19, 2018
Apr. 20, 2018
Ecker & Klein v. Jacob et al., Harding v. Jacob et al., and Buker v. Jacob et al.    
Loss Contingencies [Line Items]    
Number of shareholder derivative actions   3
Solak v. Jacob et al.    
Loss Contingencies [Line Items]    
Number of shareholder derivative actions 4