Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) Segment Source Depository Customer	Dec. 31, 2014 USD ($) Distributor Customer	Dec. 31, 2013 USD ($) Distributor	Dec. 31, 2012
Summary Of Significant Accounting Policy [Line Items]
Number of revenue sources | Source	2
Note receivable in term (up to)	5 years
Days within the original sale during which Company expects to receive payment	30 days
Accounts and notes receivable related to purchases	$ 0	$ 0
Advertising cost	$ 600,000	300,000	$ 200,000
Warranty period	1 year
Research and development costs	$ 23,614,000	14,885,000	$ 9,888,000
Allowance for doubtful accounts	$ 322,000	$ 251,000
Number of depository institutions | Depository	3
Aggregate balances in depository institution accounts	$ 57,100,000
Number of customers | Customer	0	0
Unaffiliated distributors | Distributor		1	1
Percentage of total net sales represented	10.00%	10.00%	10.00%
Accounts and notes receivable by customers one	12.50%	13.40%
Unaffiliated customers | Customer	1
Corporate owned life insurance policies fair value	$ 2,180,000	$ 1,080,000
Number of reportable segments of company | Segment	2
Reclassification of deferred tax assets to noncurrent	$ 13,719,000	16,063,000
New Accounting Pronouncement, Early Adoption, Effect
Summary Of Significant Accounting Policy [Line Items]
Reclassification of deferred tax assets to noncurrent		$ 5,200,000
Sales
Summary Of Significant Accounting Policy [Line Items]
Percentage of total net sales represented			12.20%
Minimum
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased	1 year			3 years
Maximum
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased	5 years			5 years
Evidence. Com
Summary Of Significant Accounting Policy [Line Items]
Amortization of capitalized software development costs			$ 600,000
Service term for services purchased	2 years 6 months
Extended Product Warranty
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased	5 years
Extended Product Warranty | Minimum
Summary Of Significant Accounting Policy [Line Items]
Period of extended warranty after expiration of standard warranty	1 year
Extended Product Warranty | Maximum
Summary Of Significant Accounting Policy [Line Items]
Period of extended warranty after expiration of standard warranty	5 years