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REVENUE RECOGNITION (Tables) | 3 Months Ended
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Mar. 31, 2023
Revenue from Contract with Customer [Abstract] |
Schedule of Timing of Performance Obligation | The Company's typical performance obligations include the following:
Performance Obligation |  | When Performance Obligation is Typically Satisfied |  | When Payment is Typically Due
Software and Product Revenue |  |  |  |
Software licenses (perpetual or term) |  | Upon transfer of control; typically, when made available for download (point in time) |  | Generally, within 30 days of invoicing except for term licenses, which may be paid for over time
Software licenses (subscription) |  | Upon activation of hosted site (over time) |  | Generally, within 30 days of invoicing
Hardware |  | When control of the hardware passes to the customer; typically, upon delivery (point in time) |  | Generally, within 30 days of invoicing
Software upgrades |  | Upon transfer of control; typically, when made available for download (point in time) |  | Generally, within 30 days of invoicing
Customer Support Revenue |  |  |  |
Customer support |  | Ratably over the course of the support contract (over time) |  | Generally, within 30 days of invoicing
Professional Services |  |  |  |
Other professional services (excluding training services) |  | As work is performed (over time) |  | Generally, within 30 days of invoicing (upon completion of services)
Training |  | When the class is taught (point in time) |  | Generally, within 30 days of services being performed
Schedule of Disaggregation of Revenue | The Company's revenue for the three months ended March 31, 2023 and 2022 was disaggregated as follows:
Three months ended March 31, 2023 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 38,067 |  |  | $ | 33,073 |  |  | $ | 10,853 |  |  | $ | 81,993 |
Europe, Middle East and Africa | 27,435 |  |  | 20,127 |  |  | 6,575 |  |  | 54,137 |
Asia Pacific | 25,615 |  |  | 9,372 |  |  | 3,144 |  |  | 38,131 |
Other | 2,201 |  |  | 8,016 |  |  | 1,681 |  |  | 11,898 |
| $ | 93,318 |  |  | $ | 70,588 |  |  | $ | 22,253 |  |  | $ | 186,159 |
Three months ended March 31, 2022 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 31,940 |  |  | $ | 33,064 |  |  | $ | 10,645 |  |  | $ | 75,649 |
Europe, Middle East and Africa | 24,410 |  |  | 17,742 |  |  | 6,811 |  |  | 48,963 |
Asia Pacific | 22,390 |  |  | 10,425 |  |  | 3,447 |  |  | 36,262 |
Other | 3,250 |  |  | 7,374 |  |  | 1,700 |  |  | 12,324 |
| $ | 81,990 |  |  | $ | 68,605 |  |  | $ | 22,603 |  |  | $ | 173,198 |
The Company's product revenue from indirect sales through its channel partner program and from its direct sales program for the three months ended March 31, 2023 and 2022 was as follows (in thousands):
| Three months ended |  |
| March 31, 2023 |  | March 31, 2022 |  |  |  |
Indirect sales through channel partner program | $ | 35,914 |  |  | $ | 23,500 |  |  |  |  |
Direct sales | 57,404 |  |  | 58,490 |  |  |  |  |
| $ | 93,318 |  |  | $ | 81,990 |  |  |  |  |
The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the three months ended March 31, 2023 and 2022 was as follows (in thousands):
| Three months ended |  |
| March 31, 2023 |  | March 31, 2022 |  |  |  |
Sales to enterprise customers | $ | 27,412 |  |  | $ | 22,083 |  |  |  |  |
Sales to service provider customers | 65,906 |  |  | 59,907 |  |  |  |  |
| $ | 93,318 |  |  | $ | 81,990 |  |  |  |  |
The Company's product revenue and service revenue components by segment for the three months ended March 31, 2023 and 2022 were as follows (in thousands):
| Three months ended |  |
| March 31, 2023 |  | March 31, 2022 |  |  |  |
Product revenue: |  |  |  |  |  |  |
Cloud and Edge | $ | 42,839 |  |  | $ | 37,635 |  |  |  |  |
IP Optical Networks | 50,479 |  |  | 44,355 |  |  |  |  |
Total product revenue | $ | 93,318 |  |  | $ | 81,990 |  |  |  |  |
Service revenue: |  |  |  |  |  |  |
Maintenance: |  |  |  |  |  |  |
Cloud and Edge | $ | 54,810 |  |  | $ | 55,030 |  |  |  |  |
IP Optical Networks | 15,778 |  |  | 13,575 |  |  |  |  |
Total maintenance revenue | 70,588 |  |  | 68,605 |  |  |  |  |
Professional services: |  |  |  |  |  |  |
Cloud and Edge | 16,831 |  |  | 17,141 |  |  |  |  |
IP Optical Networks | 5,422 |  |  | 5,462 |  |  |  |  |
Total professional services revenue | 22,253 |  |  | 22,603 |  |  |  |  |
Total service revenue | $ | 92,841 |  |  | $ | 91,208 |  |  |  |  |
Schedule of Customer Assets and Liabilities | The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the three months ended March 31, 2023 were as follows (in thousands):
| Accounts receivable |  | Unbilled accounts receivable |  | Deferred revenue (current) |  | Deferred revenue (long-term)
Balance at January 1, 2023 | $ | 170,969 |  |  | $ | 96,275 |  |  | $ | 113,939 |  |  | $ | 19,254 |
Increase (decrease), net | (4,228) |  |  | (7,870) |  |  | 7,822 |  |  | (898) |
Balance at March 31, 2023 | $ | 166,741 |  |  | $ | 88,405 |  |  | $ | 121,761 |  |  | $ | 18,356 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045 + Details
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