Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Commitment And Contingencies [Line Items]
Operating leases expiration period	5 years
Rent expense	$ 1.5	$ 1.8
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