Nature of Operations and Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Doubtful Accounts (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Receivables [Abstract]
Balance, beginning of year	$ 207,000	$ 195,000
Provision for doubtful accounts	210,000	115,000
Provision for estimated returns and allowances	265,000	385,000
Uncollectible accounts written-off	(76,000)	(16,000)
Returns and allowances issued	(293,000)	(472,000)
Balance, end of year	$ 313,000	$ 207,000