Subsequent Events - Additional Information (Detail) $ in Thousands	1 Months Ended	6 Months Ended
	Aug. 31, 2019 USD ($) ft²	Jul. 31, 2019 USD ($)
Subsequent Event [Line Items]
Operating leases, existence of options to extend		true
Future undiscounted cash payments		$ 7,843
Subsequent Event [Member] | Parma Obligation [Member]
Subsequent Event [Line Items]
Future undiscounted cash payments	$ 2,400
Subsequent Event [Member] | California [Member]
Subsequent Event [Line Items]
Lease term	63 months
Operating leases, existence of options to extend	true
Area of office space | ft²	47,015
Commencement date	Jun. 01, 2020
Expiration date	Aug. 31, 2025
Additional area of office space | ft²	11,722
Subsequent Event [Member] | Shanghai [Member]
Subsequent Event [Line Items]
Lease term	2 years
Area of office space | ft²	20,602
Commencement date	Dec. 01, 2019
Expiration date	Nov. 30, 2021
Future undiscounted cash payments	$ 1,500
Subsequent Event [Member] | Italy [Member] | Office Facility [Member]
Subsequent Event [Line Items]
Lease term	35 years
Subsequent Event [Member] | Santa Clara [Member]
Subsequent Event [Line Items]
Future undiscounted cash payments	$ 9,400