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Leases - Additional Information (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Lessor and Lessee Lease Description [Line Items] |  |  |
Operating lease, option to extend, existence | true |  |
Operating lease, option to terminate, existence | true |  |
Short-term lease cost |  |  | $ 400,000
Variable lease cost | $ 500,000 | $ 700,000 | $ 900,000
Future operating lease payments relating to extension of lease term | 1,600,000 |  |
Allowance for credit losses for our investment in sales type leases | $ 0 | 0 |
Minimum [Member] |  |  |
Lessor and Lessee Lease Description [Line Items] |  |  |
Operating lease, remaining lease terms | 1 month |  |
Operating lease, options to terminate term | 3 months |  |
Maximum [Member] |  |  |
Lessor and Lessee Lease Description [Line Items] |  |  |
Operating lease, remaining lease terms | 44 months |  |
Operating lease, renewal term | 2 years |  |
Short-term lease cost | $ 100,000 | $ 100,000 |
Lessor sales type lease arrangement terms for network equipments | 5 years |  |

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