Leases - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($) ft²	May 31, 2019 ft²	Jan. 31, 2019 ft²	Jan. 01, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 27,867
Operating lease right-of-use assets	23,014			$ 15,561
Future minimum lease payments	31,974
Lease cost	1,800	$ 700
Operating lease, cost	1,700	700
Short-term lease, cost	100
Operating lease, payments	$ 1,600	900
Operating lease, weighted average remaining lease term	4 years 1 month 6 days			3 years 7 months 6 days
Operating lease, weighted average discount rate, percent	6.30%			6.60%
10935 Vista Sorrento Parkway, San Diego, California
Lessee, Lease, Description [Line Items]
Operating lease, liability		3,100
Operating lease right-of-use assets		3,100
Area of office space leased | ft²						33,681	25,332
10935 Vista Sorrento Parkway, San Diego, California | Maximum
Lessee, Lease, Description [Line Items]
Operating lease extension period	4 years
Shoreline Drive, Boise, Idaho
Lessee, Lease, Description [Line Items]
Operating lease, liability	$ 6,500
Operating lease right-of-use assets					$ 6,500
Area of office space leased | ft²					94,562
Term of contract					84 months
Operating lease extension period					3 years
Future minimum lease payments	8,200
High Bluff Drive, San Diego, California
Lessee, Lease, Description [Line Items]
Operating lease, liability	2,300
Operating lease right-of-use assets			$ 2,300
Area of office space leased | ft²			30,703
Future minimum lease payments	$ 2,400
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease, liability								$ 12,400
Operating lease right-of-use assets								12,400
Accounting Standards Update 2016-02 | Difference Between Leases Guidance in Effect Before and After Topic 842
Lessee, Lease, Description [Line Items]
Deferred rent—long-term								(3,800)
Accounting Standards Update 2016-02 | Difference Between Leases Guidance in Effect Before and After Topic 842 | Other Current Liabilities
Lessee, Lease, Description [Line Items]
Deferred rent, current								$ (1,000)
Vista Sorrento Original Lease | 10935 Vista Sorrento Parkway, San Diego, California
Lessee, Lease, Description [Line Items]
Operating lease, liability		4,700
Operating lease right-of-use assets		$ 4,700