Investments (Tables)

9 Months Ended

Jun. 30, 2019

Held To Maturity Securities Classified [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, 2019, and September 30, 2018.

	As of June 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	48,567,215	$	155,327	$	(84,678	)	$	48,637,864
Commercial notes (due within three years)	$	57,555,499	$	990,610	$	—		$	58,546,109
Total	$	106,122,714	$	1,145,937	$	(84,678	)	$	107,183,973

	As of September 30, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	46,400,176	$	—	$	(429,050	)	$	45,971,126
Commercial notes (due within three years)	$	—	$	—	$	—		$	—
Total	$	46,400,176	$	—	$	(429,050	)	$	45,971,126