Fair Value of Financial Instruments (Tables)

12 Months Ended

Sep. 30, 2017

Fair Value of Company's Short-term Investments and Foreign Currency Forward Contracts

The following tables present the fair value of the Company’s short-term investments and foreign currency forward contracts at September 30, 2017, 2016 and 2015 respectively, by valuation hierarchy and input (in thousands):

	AS OF SEPTEMBER 30, 2017
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable (Level 2)		Significant Unobservable (Level 3)		Totals
Short-term investments
Corporate bonds	$	22,798	$	—	$	—	$	22,798
Government bonds		13,339		—		—		13,339
Total	$	36,137	$	—	$	—	$	36,137

	AS OF SEPTEMBER 30, 2016
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable (Level 2)			Significant Unobservable (Level 3)		Totals
Short-term investments
Corporate bonds	$	17,323	$	—		$	—	$	17,323
Government bonds		10,168		—			—		10,168
Foreign currency forward contract		—		5			—		5
Total	$	27,491	$	5		$	—	$	27,496


	AS OF SEPTEMBER 30, 2015
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable (Level 2)			Significant Unobservable (Level 3)		Totals
Short-term investments
Corporate bonds	$	15,161	$	—		$	—	$	15,161
Government bonds		2,951		—			—		2,951
Foreign currency forward contract		—		(18	)		—		(18	)
Total	$	18,112	$	(18	)	$	—	$	18,094