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Stock-based Compensation, Equity Grants, and Warrants - Stock Options Outstanding, Vested and Unvested (Details) - shares
shares in Thousands
Dec. 31, 2018
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Vested and exercisable (in shares) 1,300 1,335
Unvested (in shares) 799 799
Option outstanding (in shares) 2,099 2,134