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Restructuring - Schedule of Components of Restructuring Expenses Including in Condensed Consolidated Statements of (Loss) Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Restructuring Cost And Reserve [Line Items] |  |  |
Total restructuring expenses | $ 2 | $ 301 | $ 411
Cost of Revenue [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Total restructuring expenses | 0 | 15 |
Selling, General and Administrative Expenses [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Total restructuring expenses | 2 | 142 |
Research and Development Expenses [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Total restructuring expenses | 0 | 144 |
Network Solutions [Member] | Cost of Revenue [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Total restructuring expenses | 0 | 12 |
Services & Support [Member] | Cost of Revenue [Member] |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Total restructuring expenses | $ 0 | $ 3 |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109237686&loc=d3e17752-110868 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)(1)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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