Property and Equipment, Net - Additional Information (Detail) - USD ($)	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]
Retainage amount included in construction in progress	$ 800,000		$ 800,000		$ 400,000
Depreciation and amortization	1,823,000	$ 1,400,000	3,546,000	$ 2,723,000
Interest cost paid	200,000	300,000	500,000	600,000
Interest costs capitalized	200,000	0	200,000	0
Computer software development costs capitalized	2,000,000	800,000	3,700,000	1,600,000
Property and Equipment [Member]
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 2,800,000	$ 1,900,000	$ 5,300,000	$ 3,600,000