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General - Additional Information (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Number of operating segments | 1 |  |
Number of Reportable segment | 1 |  |
Trade receivables | $ | $ 203.0 | $ 207.9 |
Credit Concentration Risk | Revenue |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of revenue derived from distribution channels | 37.00% | 36.00% | 36.00%
Credit Concentration Risk | Revenue | First Channel Partner |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of revenue derived from distribution channels | 18.00% | 17.00% | 18.00%
Credit Concentration Risk | Revenue | Second Channel Partner |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |
Percentage of revenue derived from distribution channels | 19.00% | 19.00% | 18.00%

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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