Investments (Tables)

3 Months Ended

Dec. 31, 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 December 31, 2018, and September 30, 2018.

	As of December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial notes (due within one year)	$	53,980,307	$	201,216	$	(799,900	)	$	53,381,623
Commercial notes (due within two years)	$	59,595,287	$	27,609	$	(201,793	)	$	59,421,103
Total	$	113,575,594	$	228,825	$	(1,001,693	)	$	112,802,726

	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 two years)	$	—	$	—	$	—		$	—
Total	$	46,400,176	$	—	$	(429,050	)	$	45,971,126