Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income	$ 208	$ 4,682
Denominator:
Denominator for basic net income (loss) per common share — weighted average shares outstanding	28,467,000	27,513,000
Effect of dilutive securities:
Stock options and restricted stock units	1,147,000	562,000
Denominator for diluted net income (loss) per common share — adjusted weighted average shares	29,614,000	28,075,000
Basic net income per common share:
Net income, basic (USD per share)	$ 0.01	$ 0.17
Diluted net income per common share
Net income, diluted (USD per share)	$ 0.01	$ 0.17
Potentially dilutive securities excluded from computation of earnings per share	594,447	1,241,964