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Commitments and Contingencies - Litigation (Details)
Jan. 11, 2019
Mar. 24, 2017
officer
Jul. 31, 2017
lawsuits
David Buehring Case      
Loss Contingencies [Line Items]      
Loss contingency, number of defendants | officer   2  
Loss contingency, number of legal suit | lawsuits     3
Subsequent Event      
Loss Contingencies [Line Items]      
Loss contingency, number of legal day stay 30 days