Investments (Tables)

6 Months Ended

Mar. 31, 2015

Investments Debt And Equity Securities [Abstract]

Summary of Investments by Type of Security

The following table summarizes investments by type of security as of March 31, 2015:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
Corporate debt securities, short-term	$	19,979,906	$	998	$	(15,514	)	$	19,965,390
Corporate debt securities, long-term		2,516,760		852		—			2,517,612
Total	$	22,496,666	$	1,850	$	(15,514	)	$	22,483,002

The following table summarizes investments by type of security as of September 30, 2014:

	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Market Value
Available-for-sale securities:
Corporate debt securities, short-term	$	16,273,996	$	1,472	$	(6,298	)	$	16,269,170
Corporate debt securities, long-term		2,075,002		—		(2,984	)		2,072,018
Total	$	18,348,998	$	1,472	$	(9,282	)	$	18,341,188

Summary of Fair Value of Investments Measured on Recurring Basis

Based on the fair value hierarchy, all of the Company’s investments are classified as Level 2, as represented in the following table:

	March31,2015		September 30, 2014
Short-term investments:
Corporate debt securities
Financial	$	12,203,241	$	9,334,140
Industrial		5,853,130		3,980,772
Utility		1,909,019		756,215
Commercial paper
Financial		—		2,198,043
Total short-term investments	$	19,965,390	$	16,269,170
Long-term investments:
Corporate debt securities
Agency	$	999,740	$	—
Financial		766,410		1,564,505
Industrial		751,462		—
Utility		—		507,513
Total long-term investments	$	2,517,612	$	2,072,018