Revenues - Additional Information (Detail)	3 Months Ended	12 Months Ended
Dec. 31, 2019 USD ($)	Dec. 31, 2019 Customer	Dec. 31, 2018 Customer	Dec. 31, 2017 Customer
Decrease in net revenues \| $	$ 10,595,000
Number of customers \| Customer		1	1	1
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Percentage of total net revenues		12.70%	13.40%	13.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member] \| China [Member]
Percentage of total net revenues		22.10%	37.40%	35.80%

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://fasb.org/us-gaap/role/ref/legacyRef
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