Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value of Assets Measured on Recurring Basis

The following tables provide information by level for financial assets that are measured at fair value on a recurring basis (in thousands):

	Total carrying  value at		Fair Value Measurements Using  Inputs Considered as
	March 31, 2015		Level 1		Level 2		Level 3
Cash equivalents:
Money market	$	13,879	$	13,879	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	33,252		—		33,252		—
Commercial paper	2,000		—		2,000		—
Certificates of deposit	11,518		—		11,518		—
Total cash equivalents and marketable securities measured at fair value	$	60,649	$	13,879	$	46,770	$	—

	Total carrying  value at		Fair Value Measurements Using  Inputs Considered as
	September 30, 2014		Level 1		Level 2		Level 3
Cash equivalents:
Money market	$	19,630	$	19,630	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	26,694		—		26,694		—
Commercial paper	3,997		—		3,997		—
Certificates of deposit	13,748		—		13,748		—
Total cash equivalents and marketable securities measured at fair value	$	64,069	$	19,630	$	44,439	$	—