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Stock-based Compensation - Summary of Warrant Awards (Details) - HGI - Warrant [Member] - $ / shares
shares in Thousands
6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 600 600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price   $ 13.13
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Options Nonvested Weighted Average Grant Date Fair Value   $ 3.22
Granted $ 13.13  
Granted $ 3.22  
Stock options outstanding and expected to vest 600  
Stock options outstanding and expected to vest $ 13.13  
Restricted award expected to vest $ 3.22