Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) subsidiary country	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($) country	Sep. 30, 2016 USD ($) Segment subsidiary Source Customer country	Sep. 30, 2015 USD ($) Customer country	Dec. 31, 2015 USD ($) Customer
Summary Of Significant Accounting Policy [Line Items]
Number of wholly owned subsidiaries | subsidiary	2			2
Number of reportable segments | Segment				2
Number of revenue sources | Source				2
Warranty period				1 year
Corporate owned life insurance policies fair value	$ 3,000	$ 2,180		$ 3,000		$ 2,180
Loss on disposal of intangible assets				(21)	$ (216)
Net income	3,843		$ 1,521	10,956	14,829
Cost of products sold and services delivered	25,317		19,308	65,402	50,192
Sales, general and administrative	$ 28,121		$ 17,834	$ 77,333	$ 47,842
Recognition of Transaction
Summary Of Significant Accounting Policy [Line Items]
Net income		(800)				(800)
Cost of products sold and services delivered		$ 400
Sales, general and administrative						$ 200
Minimum
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased				3 years
Maximum
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]
Extended warranty period				1 year
Service term for services purchased				1 year
Extended Product Warranty | Maximum
Summary Of Significant Accounting Policy [Line Items]
Extended warranty period				5 years
Service term for services purchased				5 years
Evidence. Com
Summary Of Significant Accounting Policy [Line Items]
Subscription period				5 years
Device upgrade period				2 years 6 months
Geographic Concentration Risk | Sales Revenue, Net
Summary Of Significant Accounting Policy [Line Items]
Number of foreign countries | country	0		0	0	0
Customer Concentration Risk | Sales Revenue, Net
Summary Of Significant Accounting Policy [Line Items]
Number of customers | Customer				0	0
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policy [Line Items]
Number of customers | Customer				1		1
Concentration risk, percentage				18.60%		12.50%