Business Segments, Geographic Data, and Sales by Major Customers - Additional Information (Detail) - Segment	3 Months Ended	12 Months Ended
Mar. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Number of reporting segments	2
Net Accounts Receivable \| Three Largest Customers \| Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk percentage	76.70%	56.90%

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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Publisher FASB
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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