Organization and Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) account Segment	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jan. 02, 2014 Segment
Number of reportable operating segments | Segment	2			1
Investment in Canadian company accounted under cost method accounting, ownership percentage	10.00%
Impairment charge of intangible assets	$ 0	$ 0	$ 0
Number of significant allowance accounts | account	2
Allowances for doubtful accounts	$ 600,000	700,000
Allowances for service credits	700,000	600,000
Research and development expense	10,300,000	9,500,000	8,700,000
Sales Commissions	7,200,000	8,500,000	6,400,000
Total shipping costs	1,000,000	1,200,000	900,000
Advertising expenses	$ 1,700,000	2,300,000	$ 1,100,000
Reclassification of current deferred tax asset		(2,200,000)
Maximum
Amortization of intangible assets	15 years
Restructuring costs
Advertising expenses		700,000
New Accounting Pronouncement, Early Adoption, Effect
Reclassification of current deferred tax asset		$ 2,200,000