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Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net loss	$ (3,191)	$ (5,736)
Weighted-average shares outstanding - basic (in shares)	38,247	34,207
Common stock equivalents (in shares)	0	0
Weighted-average shares outstanding - diluted (in shares)	38,247	34,207
Net loss per share:
Basic (in dollars per share)	$ (0.08)	$ (0.17)
Diluted (in dollars per share)	$ (0.08)	$ (0.17)

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