Commitments, Contingencies & Guarantees - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	9 Months Ended
	Oct. 20, 2015	Sep. 30, 2013	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Incentive awarded to the company by the State of Connecticut, total				$ 11.5
Incentive awarded to the company by the State of Connecticut, non-interest bearing loans		$ 6.0		8.0
Incentive awarded to the company by the State of Connecticut, grants		1.5		$ 3.5
Non-interest bearing incentive loan term				10 years
Forgiveness awarded to the company by the state of Connecticut	$ 6.0			$ 6.0
Additional forgiveness awarded to the company by the state of Connecticut	1.0			1.0
Forgiveness awarded to the company by the State of Connecticut, grants	$ 0.5			0.5
Incentive awarded to the company by the State of Connecticut, revenue recognized			$ 0.4	1.1
Incentive awarded to the company by the State of Connecticut, deferred revenue		$ 7.5	$ 5.1	$ 5.1	$ 6.3