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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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