Property and Equipment - Additional Information (Detail) $ in Thousands		12 Months Ended
	Sep. 24, 2015 ft²	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 9,567	$ 6,219	$ 3,775
3rd Amendment, Lease exit costs associated with 650 E. Kendall.
Property, Plant and Equipment [Line Items]
Leased space surrendering date		May 29, 2015
3rd Amendment, Lease exit costs associated with 650 E. Kendall. | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Additional charge to depreciation expense due to revision of estimated useful life		$ 2,900
3rd Amendment, Lease exit costs associated with 650 E. Kendall. | upon ninety (90) days written notice
Property, Plant and Equipment [Line Items]
Lease agreement, square feet of property surrendered | ft²	49,185
3rd Amendment, Lease exit costs associated with 650 E. Kendall. | upon ninety (90) days written notice | Maximum
Property, Plant and Equipment [Line Items]
Leased space surrendering date	Sep. 24, 2015
3rd Amendment, Lease exit costs associated with 650 E. Kendall. | upon ninety (90) days written notice | Leasehold Improvements
Property, Plant and Equipment [Line Items]
Additional charge to depreciation expense due to revision of estimated useful life		$ 2,900	$ 2,400