Short-term Investments (Tables)

12 Months Ended

Sep. 30, 2018

Investments Debt And Equity Securities [Abstract]

Short-term Investments

The Company’s short-term investments were composed of the following (in thousands):

	AS OF SEPTEMBER 30, 2018
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments:
Corporate bonds	$	17,851	$	—	$	(60	)	$	17,791
Government bonds		7,702		—		(22	)		7,680
Total	$	25,553	$	—	$	(82	)	$	25,471

	AS OF SEPTEMBER 30, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments:
Corporate bonds	$	22,832	$	—	$	(34	)	$	22,798
Government bonds		13,363		—		(24	)		13,339
Total	$	36,195	$	—	$	(58	)	$	36,137