Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 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):

			Fair Value Measurements at September 30, 2015 using:
	Total carrying value at September 30, 2015		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3)
Cash equivalents:
Money market	$	14,436	$	14,436	$	—	$	—
Available-for-sale marketable securities:
Corporate bonds	35,839		—		35,839		—
Commercial paper	7,985		—		7,985		—
Certificates of deposit	13,768		—		13,768		—
Government municipal bonds	3,225		—		3,225		—
Total cash equivalents and marketable securities measured at fair value	$	75,253	$	14,436	$	60,817	$	—

			Fair Value Measurements at September 30, 2014 using:
	Total carrying value at September 30, 2014		Quoted price in active markets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (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	$	—