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Leases - Schedule of Components of Gross Profit Related to Sales-type Lease and Interest and Dividend Income Included in Consolidated Statements of Income (Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue [Member] | Network Solutions [Member] |  |  |
Lessor Lease Description [Line Items] |  |  |
Sales type leases | $ 22 | $ 78 | $ 1,723
Cost of Revenue [Member] | Network Solutions [Member] |  |  |
Lessor Lease Description [Line Items] |  |  |
Sales type leases | 5 | 32 | 675
Gross Profit [Member] |  |  |
Lessor Lease Description [Line Items] |  |  |
Sales type leases | 17 | 46 | 1,048
Interest and Dividend Income [Member] |  |  |
Lessor Lease Description [Line Items] |  |  |
Sales type leases | $ 27 | $ 42 | $ 357

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- Definition Amount of lease income from variable lease payments, interest income from net investment on sales-type lease, and profit (loss) recognized at commencement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123420820&loc=SL77919311-209978 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 6A -URI http://asc.fasb.org/extlink&oid=124502072&loc=SL77927221-108306 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919372-209981 + Details
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