Stock-based Compensation, Equity Grants, and Warrants - Stock Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2018
Number of Shares
Outstanding at the beginning of the period (in shares)	2,134
Granted (in shares)	250
Exercised (in shares)	(20)
Outstanding at the end of the period (in shares)	2,364	2,134
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 4.36
Granted (in dollars per share)	4.17
Exercised (in dollars per share)	1.34
Outstanding at the end of the period (in dollars per share)	$ 4.34	$ 4.36
Weighted Average Remaining Contractual Term
Weighted Average Remaining Contractual Term	6 years 9 months 18 days	5 years 10 months 24 days
Aggregate Intrinsic Value
Outstanding at the beginning of the period (in dollars)	$ 4,815
Outstanding at the end of the period (in dollars)	$ 4,353	$ 4,815
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility	50.00%		50.00%
Expected term (Years)	10 years
Stock price threshold term	10 days