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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended
	Jul. 18, 2019	Oct. 31, 2019	Sep. 30, 2019
Commitments and Contingencies [Line Items]
Settlement agreement date	July 18, 2019
Settlement amount	$ 9.1
Operating lease weighted average remaining lease term			6 years
Operating lease weighted average discount rate percent			3.87%
Operating Expense [Member]
Commitments and Contingencies [Line Items]
Lease cost			$ 4.6
Variable lease expense			0.6
Short-term lease expense			$ 0.1
Minimum [Member] | Office Spaces, Research and Development Laboratory Facilities, Vehicles and Office Equipment [Member]
Commitments and Contingencies [Line Items]
Remaining lease term period			1 year
Maximum [Member] | Office Spaces, Research and Development Laboratory Facilities, Vehicles and Office Equipment [Member]
Commitments and Contingencies [Line Items]
Remaining lease term period			6 years
Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Settlement amount paid		$ 9.1

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Commitments and contingencies.

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Amount awarded to other party in judgment or settlement of litigation.

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The effective date of a duly executed litigation settlement agreement.

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