Short-term Investments

6 Months Ended

Mar. 31, 2016

Investments Debt And Equity Securities [Abstract]

Short-term Investments

2. Short-term Investments

	As of March 31, 2016 (in thousands)
	Amortized Cost		Unrealized Gains		Unrealized Losses		Estimated Fair Value
Short-term investments
Corporate bonds	$	10,692	$	2	$	—	$	10,694
Government bonds		4,202		2		—		4,204
Total	$	14,894	$	4	$	—	$	14,898

	As of September 30, 2015 (in thousands)
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate bonds	$	15,166	$	—	$	(5	)	$	15,161
Government bonds		2,948		3		—			2,951
Total	$	18,114	$	3	$	(5	)	$	18,112