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Revenue from Contracts with Customers (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table summarizes revenue from contracts with customers for the years ended December 31, 2020, 2019 and 2018:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands)
Subscription revenue | $ | 304,737 |  |  | $ | 220,589 |  |  | $ | 137,442 |
Term and perpetual software licenses | 45,959 |  |  | 38,931 |  |  | 28,200 |
Maintenance and support | 31,567 |  |  | 36,778 |  |  | 42,223 |
Professional services | 28,564 |  |  | 29,050 |  |  | 33,297 |
Other | 659 |  |  | 1,599 |  |  | 2,929 |
Total revenue | $ | 411,486 |  |  | $ | 326,947 |  |  | $ | 244,091 |
The following table summarizes the revenue by region based on the shipping address of customers who have contracted to use our product or service for the years ended December 31, 2020, 2019 and 2018:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
| (in thousands)
United States | $ | 329,753 |  |  | $ | 264,852 |  |  | $ | 199,852 |
All other | 81,733 |  |  | 62,095 |  |  | 44,239 |
Total revenue | $ | 411,486 |  |  | $ | 326,947 |  |  | $ | 244,091 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction | The following table includes estimated revenue expected to be recognized in the future related to performance obligations that are unsatisfied or partially unsatisfied as of December 31, 2020. The estimated revenues do not include unexercised contract renewals.
|  | Next Twelve Months |  | Thereafter
|  | (in thousands)
Subscription revenue |  | $ | 242,115 |  |  | $ | 64,433 |
Term and perpetual software licenses |  | 33,041 |  |  | 12,851 |
Maintenance and support |  | 18,011 |  |  | 4,222 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 + Details
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