Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2015 USD ($) Source Distributor	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Distributor
Summary Of Significant Accounting Policy [Line Items]
Number Of Distributers | Distributor	1		1
Accounts and notes receivable by customers one			13.40%
Number of revenue sources | Source	2
Company receive payment	30 days
Financing receivable	$ 0.1		$ 0.0
Warranty period	1 year
Corporate owned life insurance policies fair value	$ 1.7		$ 1.1
Goodwill and intangible asset impairment	$ 0.2	$ 0.1
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