Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) Source Distributor	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Distributor
Summary Of Significant Accounting Policy [Line Items]
Number Of Distributers | Distributor	2		1
Number of revenue sources | Source	2
Company receive payment	30 days
Warranty period	1 year
Corporate owned life insurance policies fair value	$ 1.8		$ 1.1
Goodwill and intangible asset impairment	$ 0.2	$ 0.2
Extended Product Warranty | Minimum
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased	1 year
Extended Product Warranty | Maximum
Summary Of Significant Accounting Policy [Line Items]
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
Customer Concentration Risk | Accounts Receivable
Summary Of Significant Accounting Policy [Line Items]
Concentration risk, percentage	24.00%		13.40%