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REVENUE RECOGNITION (Tables) | 9 Months Ended
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Sep. 30, 2020
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
Appliances |  | When control of the appliance 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
Disaggregation of Revenue | The Company's revenue for the three and nine months ended September 30, 2020 and 2019 was disaggregated as follows:
Three months ended September 30, 2020 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 57,503 |  |  | $ | 33,275 |  |  | $ | 14,072 |  |  | $ | 104,850 |
Europe, Middle East and Africa | 41,265 |  |  | 19,720 |  |  | 7,133 |  |  | 68,118 |
Asia Pacific | 22,233 |  |  | 12,208 |  |  | 5,183 |  |  | 39,624 |
Other | 7,925 |  |  | 8,439 |  |  | 2,162 |  |  | 18,526 |
| $ | 128,926 |  |  | $ | 73,642 |  |  | $ | 28,550 |  |  | $ | 231,118 |
Three months ended September 30, 2019 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 44,701 |  |  | $ | 32,709 |  |  | $ | 10,113 |  |  | $ | 87,523 |
Europe, Middle East and Africa | 7,346 |  |  | 10,899 |  |  | 2,635 |  |  | 20,880 |
Asia Pacific | 5,517 |  |  | 7,123 |  |  | 3,219 |  |  | 15,859 |
Other | 3,588 |  |  | 8,170 |  |  | 1,633 |  |  | 13,391 |
| $ | 61,152 |  |  | $ | 58,901 |  |  | $ | 17,600 |  |  | $ | 137,653 |
Nine months ended September 30, 2020 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 150,980 |  |  | $ | 98,392 |  |  | $ | 35,482 |  |  | $ | 284,854 |
Europe, Middle East and Africa | 97,431 |  |  | 54,042 |  |  | 15,920 |  |  | 167,393 |
Asia Pacific | 59,030 |  |  | 26,742 |  |  | 14,017 |  |  | 99,789 |
Other | 18,246 |  |  | 24,157 |  |  | 5,154 |  |  | 47,557 |
| $ | 325,687 |  |  | $ | 203,333 |  |  | $ | 70,573 |  |  | $ | 599,593 |
Nine months ended September 30, 2019 | Product revenue |  | Service revenue (maintenance) |  | Service revenue (professional services) |  | Total revenue
United States | $ | 114,525 |  |  | $ | 99,281 |  |  | $ | 26,919 |  |  | $ | 240,725 |
Europe, Middle East and Africa | 32,215 |  |  | 31,016 |  |  | 8,699 |  |  | 71,930 |
Asia Pacific | 23,217 |  |  | 20,272 |  |  | 7,747 |  |  | 51,236 |
Other | 10,734 |  |  | 22,462 |  |  | 4,915 |  |  | 38,111 |
| $ | 180,691 |  |  | $ | 173,031 |  |  | $ | 48,280 |  |  | $ | 402,002 |
The Company's product revenue from indirect sales through its channel partner program and from its direct sales program for the three and nine months ended September 30, 2020 and 2019 was as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2020 |  | September 30, 2019 |  | September 30, 2020 |  | September 30, 2019
Indirect sales through channel partner program | $ | 36,586 |  |  | $ | 21,537 |  |  | $ | 97,839 |  |  | $ | 69,380 |
Direct sales | 92,340 |  |  | 39,615 |  |  | 227,848 |  |  | 111,311 |
| $ | 128,926 |  |  | $ | 61,152 |  |  | $ | 325,687 |  |  | $ | 180,691 |
The Company's product revenue from sales to enterprise customers and from sales to service provider customers for the three and nine months ended September 30, 2020 and 2019 was as follows (in thousands):
| Three months ended |  | Nine months ended
| September 30, 2020 |  | September 30, 2019 |  | September 30, 2020 |  | September 30, 2019
Sales to enterprise customers | $ | 36,937 |  |  | $ | 17,458 |  |  | $ | 100,168 |  |  | $ | 47,295 |
Sales to service provider customers | 91,989 |  |  | 43,694 |  |  | 225,519 |  |  | 133,396 |
| $ | 128,926 |  |  | $ | 61,152 |  |  | $ | 325,687 |  |  | $ | 180,691 |
Schedule of Customer Assets and Liabilities | The changes in the Company's accounts receivable, unbilled receivables and deferred revenue balances for the nine months ended September 30, 2020 were as follows (in thousands):
| Accounts receivable |  | Unbilled accounts receivable |  | Deferred revenue (current) |  | Deferred revenue (long-term)
Balance at January 1, 2020 | $ | 168,502 |  |  | $ | 24,204 |  |  | $ | 100,406 |  |  | $ | 20,482 |
Increase (decrease), net | (14,990) |  |  | 30,097 |  |  | (6,959) |  |  | 803 |
Balance at September 30, 2020 | $ | 153,512 |  |  | 54,301 |  |  | $ | 93,447 |  |  | $ | 21,285 |

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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 http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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