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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Impact of Adopting ASC 606 on Audited Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable | $ 60,666 |  | $ 16,911
Deferred contract costs, prepaid expenses and other current assets | 21,853 |  | 37,772
Customer advances | 561 |  | 21,828
Deferred Revenue | 3,947 |  | 7,286
Accumulated earnings | (1,212,790) |  | $ (1,226,173)
Balance Without Adoption of ASC 606 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable | 31,060 |  |
Deferred contract costs, prepaid expenses and other current assets | 73,120 |  |
Customer advances | 26,582 |  |
Deferred Revenue | 3,826 |  |
Accumulated earnings | (1,217,029) |  |
ASU 2014-09 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred contract costs, prepaid expenses and other current assets |  | $ 27,926 |
Customer advances |  | 6,605 |
Deferred Revenue |  | 4,743 |
Accumulated earnings |  | (1,217,610) |
ASU 2014-09 | Effect of Change Higher/(Lower) |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Accounts receivable | (29,606) |  |
Deferred contract costs, prepaid expenses and other current assets | 51,267 | (9,846) |
Customer advances | (26,021) | (15,223) |
Deferred Revenue | 121 | (2,543) |
Accumulated earnings | $ 4,239 | $ 8,563 |

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: 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)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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