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Commitments and Contingencies - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) Customer	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Concentration Risk [Line Items]
Number of customers accounted for sale | Customer	10
Rent expense | $	$ 0.1	$ 0.2	$ 0.2
Customer Concentration Risk | Consolidated Sales | Ten Largest Customers
Concentration Risk [Line Items]
Sales Revenue, percentage	44.00%	44.00%	46.00%
Customer Concentration Risk | Consolidated Sales | Customer One | Security Products
Concentration Risk [Line Items]
Sales Revenue, percentage	13.00%	16.00%	14.00%
Customer Concentration Risk | Consolidated Sales | Customer Two | Security Products
Concentration Risk [Line Items]
Sales Revenue, percentage			11.00%

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- Definition

Concentration risk number of customer.

+ References

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- Definition

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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