Commitments and Contingencies - Additional Information (Detail) $ in Millions		3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 19, 2016 USD ($) Installment	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) $ / ft²	Sep. 30, 2015 USD ($)	Dec. 31, 2013 People	Jun. 27, 2016 USD ($)	Sep. 26, 2011 USD ($)
Leases [Abstract]
Expiration of non-cancellable operating leases				Through 2022
Accrued lease commitments expense		$ 4.2		$ 4.2
Estimated sublease income		2.2		2.2
Rent expense under operating leases		$ 0.4	$ 0.3	$ 1.1	$ 1.0
Incentives per square feet | $ / ft²				40.00
Incentives for improvements to space				$ 2.2
Lease agreement term				10 years
Amount received to start-up new facility								$ 1.0
Minimum number of people to be employed | People						232
Time period to meet employment commitment						3 years
New deadline to meet employment commitment				Apr. 30, 2016
Repayment of granted amount under the agreement	$ 0.3
Interest rate of funds under the agreement	0.00%
Number of equal quarterly installments | Installment	20
Grant earned under agreement							$ 0.7