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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 156,391 | $ 128,048 | $ 300,182 | $ 248,854
Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 109,421 | 84,742 | 209,199 | 166,422
Subscriber Solutions & Experience [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 40,502 | 34,560 | 77,255 | 64,661
Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 6,468 | 8,746 | 13,728 | 17,771
Network Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 139,167 | 115,063 | 264,989 | 220,316
Network Solutions [Member] | Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 96,262 | 75,222 | 181,935 | 144,607
Network Solutions [Member] | Subscriber Solutions & Experience [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 38,444 | 33,306 | 73,163 | 62,083
Network Solutions [Member] | Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 4,461 | 6,535 | 9,891 | 13,626
Services & Support [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 17,224 | 12,985 | 35,193 | 28,538
Services & Support [Member] | Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 13,159 | 9,520 | 27,264 | 21,815
Services & Support [Member] | Subscriber Solutions & Experience [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 2,058 | 1,254 | 4,092 | 2,578
Services & Support [Member] | Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 2,007 | $ 2,211 | $ 3,837 | $ 4,145

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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