Subsequent Events - Additional Information (Detail) - ft²	3 Months Ended
	Mar. 31, 2016	Apr. 01, 2016
Los Angeles
Subsequent Event [Line Items]
Lease commencement date	Apr. 01, 2016
Los Angeles | Subsequent Event
Subsequent Event [Line Items]
Additional square feet leased		26,000
South San Francisco
Subsequent Event [Line Items]
Lease commencement date	Apr. 01, 2016
South San Francisco | Subsequent Event
Subsequent Event [Line Items]
Additional square feet leased		13,000