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REVENUE RECOGNITION (Tables) | 12 Months Ended
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Dec. 31, 2022
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 total revenue for the years ended December 31, 2022, 2021 and 2020 was disaggregated geographically as follows:
Year ended December 31, 2022 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 175,189 |  |  | $ | 132,655 |  |  | $ | 44,819 |  |  | $ | 352,663 |
Europe, Middle East and Africa | 147,523 |  |  | 75,948 |  |  | 29,310 |  |  | 252,781 |
Asia Pacific | 95,828 |  |  | 41,677 |  |  | 13,594 |  |  | 151,099 |
Other | 24,140 |  |  | 31,815 |  |  | 7,262 |  |  | 63,217 |
| $ | 442,680 |  |  | $ | 282,095 |  |  | $ | 94,985 |  |  | $ | 819,760 |
Year ended December 31, 2021 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 196,058 |  |  | $ | 132,683 |  |  | $ | 47,296 |  |  | $ | 376,037 |
Europe, Middle East and Africa | 138,203 |  |  | 79,475 |  |  | 30,349 |  |  | 248,027 |
Asia Pacific | 92,803 |  |  | 41,945 |  |  | 18,183 |  |  | 152,931 |
Other | 25,978 |  |  | 32,218 |  |  | 9,766 |  |  | 67,962 |
| $ | 453,042 |  |  | $ | 286,321 |  |  | $ | 105,594 |  |  | $ | 844,957 |
Year ended December 31, 2020 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 201,347 |  |  | $ | 132,661 |  |  | $ | 48,611 |  |  | $ | 382,619 |
Europe, Middle East and Africa | 149,567 |  |  | 73,475 |  |  | 25,226 |  |  | 248,268 |
Asia Pacific | 90,201 |  |  | 36,628 |  |  | 19,627 |  |  | 146,456 |
Other | 26,797 |  |  | 32,052 |  |  | 7,603 |  |  | 66,452 |
| $ | 467,912 |  |  | $ | 274,816 |  |  | $ | 101,067 |  |  | $ | 843,795 |
The Company's product revenue from its direct sales program and from indirect sales through its channel partner program for the years ended December 31, 2022, 2021 and 2020 was as follows (in thousands):
| Year ended December 31,
| 2022 |  | 2021 |  | 2020
Indirect sales through channel program | $ | 131,998 |  |  | $ | 117,065 |  |  | $ | 134,876 |
Direct sales | 310,682 |  |  | 335,977 |  |  | 333,036 |
| $ | 442,680 |  |  | $ | 453,042 |  |  | $ | 467,912 |
The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the years ended December 31, 2022, 2021 and 2020 was as follows (in thousands):
| Year ended December 31,
| 2022 |  | 2021 |  | 2020
Sales to enterprise customers | $ | 125,664 |  |  | $ | 111,494 |  |  | $ | 138,469 |
Sales to service provider customers | 317,016 |  |  | 341,548 |  |  | 329,443 |
| $ | 442,680 |  |  | $ | 453,042 |  |  | $ | 467,912 |
The Company's product revenue and service revenue components by segment for the years ended December 31, 2022, 2021 and 2020 was as follows (in thousands):
| Year ended December 31,
| 2022 |  | 2021 |  | 2020
Product revenue |  |  |  |  |
Cloud and Edge | 215,770 |  |  | 248,570 |  |  | 275,445 |
IP Optical Networks | 226,910 |  |  | 204,472 |  |  | 192,467 |
Total product revenue | 442,680 |  |  | 453,042 |  |  | 467,912 |
Service revenue |  |  |  |  |
Maintenance |  |  |  |  |
Cloud and Edge | 222,238 |  |  | 228,321 |  |  | 229,035 |
IP Optical Networks | 59,857 |  |  | 58,000 |  |  | 45,781 |
Total maintenance revenue | 282,095 |  |  | 286,321 |  |  | 274,816 |
Professional services |  |  |  |  |
Cloud and Edge | 70,130 |  |  | 79,765 |  |  | 78,790 |
IP Optical Networks | 24,855 |  |  | 25,829 |  |  | 22,277 |
Total professional services revenue | 94,985 |  |  | 105,594 |  |  | 101,067 |
Total service revenue | 377,080 |  |  | 391,915 |  |  | 375,883 |
Schedule of customer assets and liabilities | The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the years ended December 31, 2022 and 2021 were as follows (in thousands):
| Accounts receivable |  | Unbilled accounts receivable |  | Deferred revenue (current) |  | Deferred revenue (long-term)
Balance at January 1, 2022 | $ | 208,972 |  |  | $ | 73,945 |  |  | $ | 109,119 |  |  | $ | 20,619 |
Increase (decrease), net | (38,003) |  |  | 22,330 |  |  | 4,820 |  |  | (1,365) |
Balance at December 31, 2022 | $ | 170,969 |  |  | $ | 96,275 |  |  | $ | 113,939 |  |  | $ | 19,254 |
| Accounts receivable |  | Unbilled accounts receivable |  | Deferred revenue (current) |  | Deferred revenue (long-term)
Balance at January 1, 2021 | $ | 179,331 |  |  | $ | 58,407 |  |  | $ | 96,824 |  |  | $ | 26,010 |
Increase (decrease), net | 29,641 |  |  | 15,538 |  |  | 12,295 |  |  | (5,391) |
Balance at December 31, 2021 | $ | 208,972 |  |  | $ | 73,945 |  |  | $ | 109,119 |  |  | $ | 20,619 |

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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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