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Segment Reporting, Geographic Information and Concentration of Credit Risk - Additional Information (Detail) - Customer | 3 Months Ended | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Segment Reporting [Abstract] |  |  |
Concentration Risk, Customer | No customer accounted for 10% or more of net revenue for either of the three months ended March 31, 2019 or 2018. One customer accounted for 10% of net accounts receivable at March 31, 2019. No customer accounted for 10% or more of net accounts receivable balance at December 31, 2018. |  |
Number of major customer represented stated percentage of total net revenue | 0 | 0 |
Number of customers who accounted for 10% or more net accounts receivable | 1 |  | 0

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- Definition Number of customer represented stated percentage of accounts receivable net. + References No definition available. + Details
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- Definition Number​ of customer​ accounts for more than minimum threshold percentage​ of revenue. + References No definition available. + Details
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- Definition Description of risks that arise due to the volume of business transacted with a particular customer. At a minimum, the description informs financial statement users of the general nature of the risk, but excludes "Information about Major Customers" that may be disclosed elsewhere (for instance, segment disclosures). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6327-108592 + Details
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- References No definition available. + Details
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