Significant Customers And Concentrations Of Credit Risk - Additional Information (Detail) - Customer Concentration Risk [Member] - Sales Revenue, Net [Member] - Customers |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Concentrations Of Credit Risk And Major Customers Revenue [Line Items] | ||||
| Concentration risk percentage | 49.70% | 65.70% | 52.10% | 67.20% |
| Number of major customers | 10 | |||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Concentration risk number of customers. No definition available.
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- Definition Concentrations Of Credit Risk And Major Customers Revenue [Line Items] No definition available.
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