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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Disaggregation of Revenue | Revenue consists primarily of two categories: (1) cloud communications and (2) messaging surcharges, which are described and quantified below.
| Year ended December 31,
| 2023 |  | 2022 |  | 2021
| (In thousands)
Cloud communications | $ | 478,892 |  |  | $ | 474,576 |  |  | $ | 449,656 |
Messaging surcharges | 122,225 |  |  | 98,576 |  |  | 41,251 |
Total revenue | $ | 601,117 |  |  | $ | 573,152 |  |  | $ | 490,907 |
Schedule of Contract Assets and Liabilities | The following table provides information about receivables and contract liabilities from contracts with customers:
| As of December 31,
| 2023 |  | 2022
| (In thousands)
Receivables (1) | $ | 78,155 |  |  | $ | 74,465 |
Contract liabilities (2) | 16,465 |  |  | 15,487 |
________________________ (1) Included in accounts receivable, net of allowance for doubtful accounts on the consolidated balance sheets. (2) Included in current portion of deferred revenue and deferred revenue, net of current portion on the consolidated balance sheets.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-10 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-5 + Details
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