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Segment Information and Major Customers - Additional Information (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) Customer Segment Category | Dec. 31, 2016 USD ($) Customer | Dec. 31, 2015 Customer
Segment Reporting Information [Line Items] |  |  |
Number of reportable segments | Segment | 2 |  |
Number of categories | Category | 3 |  |
Number of single customer comprising more than 10% of revenue | Customer | 2 | 3 | 3
Long-lived assets | $ 85.1 | $ 84.5 |
U.S. [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long-lived assets | 80.6 | 79.9 |
Outside U.S. [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Long-lived assets | $ 4.5 | $ 4.6 |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 1 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 40.00% | 24.00% | 20.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 2 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 16.00% | 19.00% | 17.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer 3 [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage |  | 12.00% | 14.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | The Five Largest Customers Other Than Those With More Than 10% Of Revenues [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Concentration risk, percentage | 15.00% | 13.00% | 14.00%

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