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Revenue - Disaggregate of Revenue by Reportable Segment and Revenue Category (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Revenue	$ 130,129	$ 133,143	$ 128,715	$ 114,523	$ 115,787	$ 114,092	$ 156,391	$ 143,791	$ 506,510	$ 530,061	$ 529,277
Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue									313,138	348,874	358,870
Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue									171,087	152,920	134,460
Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									22,285	28,267	35,947
Network Solutions [Member]
Disaggregation Of Revenue [Line Items]
Revenue									438,015	455,226	458,232
Network Solutions [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue									262,578	289,980	301,801
Network Solutions [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue									161,824	144,651	129,067
Network Solutions [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									13,613	20,595	27,364
Services & Support [Member]
Disaggregation Of Revenue [Line Items]
Revenue									68,495	74,835	71,045
Services & Support [Member] | Access & Aggregation [Member]
Disaggregation Of Revenue [Line Items]
Revenue									50,560	58,894	57,069
Services & Support [Member] | Subscriber Solutions & Experience [Member]
Disaggregation Of Revenue [Line Items]
Revenue									9,263	8,269	5,393
Services & Support [Member] | Traditional & Other Products [Member]
Disaggregation Of Revenue [Line Items]
Revenue									$ 8,672	$ 7,672	$ 8,583

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No definition available.

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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

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