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Chief Executive Officer Succession Plan (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended
Nov. 05, 2018
Sep. 30, 2018
Nov. 04, 2018
Subsequent Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Consulting agreement period 10 days    
CEO [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash separation payment   $ 23,971  
Additional stock-based compensation expense   $ 334  
CEO [Member] | Subsequent Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash separation payment     $ 34,295
Continuation costs     208
Additional stock-based compensation expense     $ 470
Former CEO [Member] | Subsequent Event [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Consulting fees $ 975