Property and Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 345,422		$ 345,422		$ 296,666
Facility lease obligation	275,800		275,800		231,700
Depreciation and amortization expense	1,200	$ 800	2,400	$ 1,700
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 292,683		$ 292,683		$ 246,669