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Segment Information - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Customer Concentration Risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Description of customer revenue accounted for more than 10% of consolidated revenue |  | No single customer accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2018 and 2017. |
Geographic Concentration Risk [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Description of customer revenue accounted for more than 10% of consolidated revenue |  | No other country outside the United States and the United Kingdom accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2017. No other country outside the United States accounted for more than 10% of the Company's consolidated revenues during the three and six months ended June 30, 2018. |
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Percentage of revenues attributable to customers | 11.40% |  | 11.40%

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