Property and Equipment, Net - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property Plant and Equipment Useful Life and Values [Abstract]
Depreciation expense	$ 5,500,000	$ 4,200,000	$ 2,800,000
Gross amount of fully depreciated fixed assets disposed	303,000	1,603,000	210,000
Recognized impairment charges	$ 0	$ 0	$ 0