Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Commitment And Contingencies [Line Items]
Operating leases expiration period			5 years
Rent expense	$ 0.4	$ 0.4	$ 1.3	$ 1.3
Minimum
Commitment And Contingencies [Line Items]
Term of warranties on certain product sales			12 months
Maximum
Commitment And Contingencies [Line Items]
Term of warranties on certain product sales			24 months