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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, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 143,232 | $ 128,715 | $ 270,765 | $ 243,238
Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 90,964 | 82,776 | 160,038 | 148,742
Subscriber Solutions & Experience [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 47,810 | 40,393 | 102,379 | 82,572
Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 4,458 | 5,546 | 8,348 | 11,924
Network Solutions [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 125,449 | 111,323 | 239,258 | 208,695
Network Solutions [Member] | Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 78,307 | 69,721 | 138,360 | 122,776
Network Solutions [Member] | Subscriber Solutions & Experience [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 45,097 | 38,081 | 97,366 | 78,064
Network Solutions [Member] | Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 2,045 | 3,521 | 3,532 | 7,855
Services & Support [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 17,783 | 17,392 | 31,507 | 34,543
Services & Support [Member] | Access & Aggregation [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 12,657 | 13,055 | 21,678 | 25,966
Services & Support [Member] | Subscriber Solutions & Experience [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | 2,713 | 2,312 | 5,013 | 4,508
Services & Support [Member] | Traditional & Other Products [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Revenue | $ 2,413 | $ 2,025 | $ 4,816 | $ 4,069

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9031-108599 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8933-108599 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130543-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8736-108599 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9054-108599 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 924 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 11.L) -URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856 + Details
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