Short-term Investments

12 Months Ended

Sep. 30, 2017

Investments Debt And Equity Securities [Abstract]

Short-term Investments

2. Short-term Investments

During the fiscal years ended September 30, 2017, 2016 and 2015 the Company realized losses of $3,000, $5,000 and $7,000, respectively, from the sale of short-term investments.  The realized losses are recorded in Other Income (Expense) on the consolidated statements of operations.  At September 30, 2017, 2016 and 2015, the Company’s short-term investments were composed of the following (in thousands):

	AS OF SEPTEMBER 30, 2017
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate bonds	$	22,829	$	—	$	(31	)	$	22,798
Government bonds		13,363		—		(24	)		13,339
Total	$	36,192	$	—	$	(55	)	$	36,137

	AS OF SEPTEMBER 30, 2016
	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Short-term investments
Corporate bonds	$	17,342	$	—	$	(19	)	$	17,323
Government bonds		10,169		—		(1	)		10,168
Total	$	27,511	$	—	$	(20	)	$	27,491
	AS OF SEPTEMBER 30, 2015
	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

The Company’s short-term investments have contractual maturities ranging from October 2017 to October 2019.