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		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Net loss	$ (99)	$ (2,784)	$ (4,006)	$ (9,680)
Weighted-average shares outstanding - basic (in shares)	39,936	36,190	39,034	35,122
Common stock equivalents (in shares)	0	0	0	0
Weighted-average shares outstanding - diluted (in shares)	39,936	36,190	39,034	35,122
Net loss per share:
Basic (in dollars per share)	$ (0.00)	$ (0.08)	$ (0.10)	$ (0.28)
Diluted (in dollars per share)	$ (0.00)	$ (0.08)	$ (0.10)	$ (0.28)