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Contract Balances (Tables) | 12 Months Ended
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Dec. 31, 2018
Contract With Customer Asset And Liability [Abstract] |
Schedule of Accounts Receivable | Accounts receivable (in thousands) consisted of the following, as of:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  |  |  |  |  | (as adjusted) |
Billed and billable |  | $ | 176,848 |  |  | $ | 169,554 |
Less: allowance for doubtful accounts |  |  | (5,489 | ) |  |  | (4,190 | )
Accounts receivable, net |  | $ | 171,359 |  |  | $ | 165,364 |
Deferred Revenue and Advance Payments | Deferred revenue and advance payments (in thousands) from customers consisted of the following, as of:
|  | December 31, |
|  | 2018 |  |  | 2017 |
|  |  |  |  |  | (as adjusted) |
Current: |  |  |  |  |  |  |  |
Deferred product licenses revenue |  | $ | 1,768 |  |  | $ | 3,760 |
Deferred subscription services revenue |  |  | 13,508 |  |  |  | 17,324 |
Deferred product support revenue |  |  | 152,501 |  |  |  | 168,185 |
Deferred other services revenue |  |  | 8,763 |  |  |  | 9,465 |
Total current deferred revenue and advance payments |  | $ | 176,540 |  |  | $ | 198,734 |
Non-current: |  |  |  |  |  |  |  |
Deferred product licenses revenue |  | $ | 542 |  |  | $ | 820 |
Deferred subscription services revenue |  |  | 2,384 |  |  |  | 126 |
Deferred product support revenue |  |  | 3,091 |  |  |  | 4,826 |
Deferred other services revenue |  |  | 452 |  |  |  | 628 |
Total non-current deferred revenue and advance payments |  | $ | 6,469 |  |  | $ | 6,400 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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