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Investments - Summary of Investments by Type of Security (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Schedule Of Available For Sale Securities [Line Items]
Cost	$ 45,781	$ 41,890
Gross Unrealized Gains	55	111
Gross Unrealized Losses	(1)	(3)
Fair Market Value	45,835	41,998
Short-term investments | U.S. Treasury
Schedule Of Available For Sale Securities [Line Items]
Cost	9,557	10,245
Gross Unrealized Gains	14	38
Gross Unrealized Losses	0	0
Fair Market Value	9,571	10,283
Short-term investments | Asset-backed securities
Schedule Of Available For Sale Securities [Line Items]
Cost	3,914	4,723
Gross Unrealized Gains	21	36
Gross Unrealized Losses	0	0
Fair Market Value	3,935	4,759
Short-term investments | Corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Cost	26,713	24,956
Gross Unrealized Gains	20	37
Gross Unrealized Losses	(1)	0
Fair Market Value	26,732	24,993
Long-term investments | U.S. Treasury
Schedule Of Available For Sale Securities [Line Items]
Cost	2,745
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Market Value	2,745
Long-term investments | Asset-backed securities
Schedule Of Available For Sale Securities [Line Items]
Cost	962
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Market Value	962
Long-term investments | Corporate debt securities
Schedule Of Available For Sale Securities [Line Items]
Cost	1,890	1,966
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(3)
Fair Market Value	$ 1,890	$ 1,963

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