Lease Obligations - Schedule of Office Space Lease Agreements in Place for Real Properties (Detail) - ft²	3 Months Ended
	Mar. 31, 2020	Oct. 14, 2019
Dublin Office [Member]
Lessee Lease Description [Line Items]
Approximate Square Feet	18,900	63,000
Lease Expiry Date	Nov. 04, 2029
Lake Forest Office [Member]
Lessee Lease Description [Line Items]
Approximate Square Feet	160,000
Lease Expiry Date	Mar. 31, 2031
Novato Office [Member]
Lessee Lease Description [Line Items]
Approximate Square Feet	61,000
Lease Expiry Date	Aug. 31, 2021
South San Francisco Office [Member]
Lessee Lease Description [Line Items]
Approximate Square Feet	20,000
Lease Expiry Date	Jan. 31, 2030
Chicago Office [Member]
Lessee Lease Description [Line Items]
Approximate Square Feet	9,200
Lease Expiry Date	Dec. 31, 2028
Mannheim Office [Member]
Lessee Lease Description [Line Items]
Approximate Square Feet	4,800
Lease Expiry Date	Dec. 31, 2020
Other Office
Lessee Lease Description [Line Items]
Approximate Square Feet	12,400
Other Office | Minimum [Member]
Lessee Lease Description [Line Items]
Lease Expiry Date	May 31, 2020
Other Office | Maximum [Member]
Lessee Lease Description [Line Items]
Lease Expiry Date	Sep. 15, 2022