Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2015 Source Distributor	Mar. 31, 2014	Dec. 31, 2014 Distributor
Summary Of Significant Accounting Policy [Line Items]
Number Of Distributers	1		1
Accounts and notes receivable by customers one	10.10%		13.40%
Number of revenue sources	2
Company receive payment	30 days
Warranty period	1 year
Corporate owned life insurance policies fair value	$ 1.5		$ 1.1
Goodwill and intangible asset impairment	$ 0.1	$ 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