Organization and Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013 Source Distributor Customer Depository Segment	Dec. 31, 2012 Customer Distributor	Dec. 31, 2011 Customer Distributor
Summary Of Significant Accounting Policy [Line Items]
Capitalized software development costs	$ 0	$ 0	$ 0
Remaining amortized relating to capitalized software development costs	31,378,000	28,893,000
Impairment charge			1,354,000
Impairment losses	0	0
Number of revenue sources	2
Note receivable in term	5 years
Company receive payment	30 days
Accounts and notes receivable related to purchases	0	3,100,000
Advertising Cost	200,000	200,000	300,000
Warranty period	1 year
Research and development costs	9,888,000	8,139,000	9,989,000
Minimum Percentage of tax benefit to be realized upon final settlement	50.00%
Allowance for doubtful accounts	200,000	200,000
Reserve for bad debt expense	24,000	(242,000)	296,000
Number of depository institutions	3
Aggregate balances in accounts	63,400,000
Percentage of total net sales represented	10.00%	10.00%	10.00%
Unaffiliated distributors	1	1	1
Accounts and notes receivable by customers one	17.40%	17.20%
Unaffiliated customers	1	1
Corporate owned life insurance policies fair value	400,000
Number of reportable segments of company	2
Aggregated operating segments	0
Number of customer outside the united states	0	0	0
Options awarded	0	0
Implied volatility period of publicly traded options	1 year
Decrease in long term deferred tax asset due to adoption of new accounting guidance	1,500,000
Decrease in unrecognized tax benefits due to adoption of new accounting guidance	1,500,000
Distributor [Member]
Summary Of Significant Accounting Policy [Line Items]
Reserve for bad debt expense			300,000
Sales [Member]
Summary Of Significant Accounting Policy [Line Items]
Percentage of total net sales represented	12.20%	12.80%	12.70%
Minimum [Member]
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased	1 year
Contractual Period of entities assurance program	3 years
Minimum [Member] | Sales [Member]
Summary Of Significant Accounting Policy [Line Items]
Percentage of total net sales represented	10.00%
Maximum [Member]
Summary Of Significant Accounting Policy [Line Items]
Service term for services purchased	5 years
Contractual Period of entities assurance program	5 years
Parent [Member]
Summary Of Significant Accounting Policy [Line Items]
Capitalized software development costs			800,000
Evidence. Com [Member]
Summary Of Significant Accounting Policy [Line Items]
Amortization of capitalized software development costs	600,000	1,200,000	1,300,000
Remaining amortized relating to capitalized software development costs	0
Protector Product Line [Member]
Summary Of Significant Accounting Policy [Line Items]
Impairment charge			1,400,000
Impairment charge of long-lived assets			$ 2,800,000
Extended Product Warranty [Member] | Minimum [Member]
Summary Of Significant Accounting Policy [Line Items]
Period of extended warranty after expiration of standard warranty	1 year
Extended Product Warranty [Member] | Maximum [Member]
Summary Of Significant Accounting Policy [Line Items]
Period of extended warranty after expiration of standard warranty	5 years