Short-term Investments

6 Months Ended

Mar. 31, 2019

Investments Debt And Equity Securities [Abstract]

Short-term Investments

4.   Short-term Investments

	As of March 31, 2019 (in thousands)
	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Short-term investments:
Government bonds	$	747	$	1	$	—	$	748

	As of September 30, 2018 (in thousands)
	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

The Company’s short-term investments have contractual maturities in February 2020.