Investments (Tables)

9 Months Ended

Jun. 30, 2018

Equity [Abstract]

Summary of Short-term and Long-term Investments

The following tables summarize the Company’s short-term and long-term investments as of June 30, 2018, and September 30, 2017.

	As of June 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	32,484,708	$	—	$	(237,007	)	$	32,247,701
Commercial notes (due after one year through two years)	$	17,672,658		—	$	(98,327	)	$	17,574,331
Total	$	50,157,366	$	—	$	(335,334	)	$	49,822,032

	As of September 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	40,769,539	$	—	$	(334,755	)	$	40,434,784
Commercial notes (due after one year through two years)	$	—		—	$	—		$	—
Total	$	40,769,539	$	—	$	(334,755	)	$	40,434,784