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Stock-based Compensation, Equity Grants, and Warrants - Stock Options Outstanding, Vested and Unvested (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Share-based Payment Arrangement [Abstract]      
Vested and exercisable (in shares) 1,072   1,300
Unvested (in shares) 807   834
Option outstanding (in shares) 1,879   2,134
Weighted average exercise price (in dollars per share) $ 1.61   $ 1.51
Aggregate intrinsic value $ 5.9   $ 3.9
Weighted average remaining term 3 years 2 months 12 days 3 years 9 months 18 days