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Deferred Revenue and Advance Payments | 12 Months Ended
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Dec. 31, 2015
Deferred Revenue and Advance Payments | (9) Deferred Revenue and Advance Payments Deferred revenue and advance payments (in thousands) from customers consisted of the following, as of:
|  | December 31, |
|  | 2015 |  |  | 2014 |
Current: |  |  |  |  |  |  |  |
Deferred product licenses revenue |  | $ | 13,506 |  |  | $ | 10,927 |
Deferred subscription services revenue |  |  | 15,763 |  |  |  | 16,018 |
Deferred product support revenue |  |  | 158,738 |  |  |  | 168,833 |
Deferred other services revenue |  |  | 9,149 |  |  |  | 10,564 |
Gross current deferred revenue and advance payments |  |  | 197,156 |  |  |  | 206,342 |
Less: unpaid deferred revenue |  |  | (96,461 | ) |  |  | (97,929 | )
Net current deferred revenue and advance payments |  | $ | 100,695 |  |  | $ | 108,413 |
Non-current: |  |  |  |  |  |  |  |
Deferred product licenses revenue |  | $ | 5,397 |  |  | $ | 8,012 |
Deferred subscription services revenue |  |  | 2,138 |  |  |  | 750 |
Deferred product support revenue |  |  | 7,607 |  |  |  | 7,505 |
Deferred other services revenue |  |  | 795 |  |  |  | 1,047 |
Gross non-current deferred revenue and advance payments |  |  | 15,937 |  |  |  | 17,314 |
Less: unpaid deferred revenue |  |  | (6,942 | ) |  |  | (6,496 | )
Net non-current deferred revenue and advance payments |  | $ | 8,995 |  |  | $ | 10,818 |
The Company offsets its accounts receivable and deferred revenue for any unpaid items included in deferred revenue and advance payments.

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- Definition The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.3(b).Q1(c),(b).Q2,(c).Q3) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration