Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($)
Commitments and Contingencies [Line Items]
Purchase obligation	$ 4.4
Minimum
Commitments and Contingencies [Line Items]
Severance payment term	12 months
Maximum
Commitments and Contingencies [Line Items]
Severance payment term	36 months