Organization and Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended			12 Months Ended
	Mar. 31, 2016 USD ($) Segment Source Customer country	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($) Customer country	Dec. 31, 2015 USD ($) Customer
Summary Of Significant Accounting Policy [Line Items]
Number of reportable segments | Segment	2
Number of revenue sources | Source	2
Warranty period	1 year
Corporate owned life insurance policies fair value	$ 2,500,000	$ 2,200,000		$ 2,200,000
Goodwill and intangible asset impairment	0		$ 100,000
Net income	3,463,000		7,205,000
Cost of products sold and services delivered	18,628,000		14,894,000
Sales, general and administrative	$ 24,833,000		$ 14,565,000
Recognition of Transaction
Summary Of Significant Accounting Policy [Line Items]
Net income		(700,000)		(700,000)
Cost of products sold and services delivered		$ (400,000)
Sales, general and administrative				$ (200,000)
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	1		0
Concentration risk, percentage	10.90%
Customer Concentration Risk | Sales Revenue, Net
Summary Of Significant Accounting Policy [Line Items]
Number of Customers | Customer	1		0
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policy [Line Items]
Concentration risk, percentage	20.20%			12.50%
Number of Customers | Customer	1			1