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Investments - Summary of Investments by Type of Security (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 26,961	$ 26,810
Gross Unrealized Gains	4	11
Gross Unrealized Losses	(18)	(6)
Fair Market Value	26,947	26,815
U.S. Treasury, short-term
Schedule Of Available For Sale Securities [Line Items]
Cost		12,907
Gross Unrealized Gains		8
Gross Unrealized Losses		0
Fair Market Value		12,915
U.S. Treasury, short-term | Short-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	10,002
Gross Unrealized Gains	0
Gross Unrealized Losses	(5)
Fair Market Value	9,997
U.S. Treasury, short-term | Long-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	1,399
Gross Unrealized Gains	0
Gross Unrealized Losses	(1)
Fair Market Value	1,398
Corporate debt securities | Short-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	13,062	11,949
Gross Unrealized Gains	2	2
Gross Unrealized Losses	(10)	(3)
Fair Market Value	13,054	11,948
Corporate debt securities | Long-term investments
Schedule Of Available For Sale Securities [Line Items]
Cost	2,498	1,954
Gross Unrealized Gains	2	1
Gross Unrealized Losses	(2)	(3)
Fair Market Value	$ 2,498	$ 1,952

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 25
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