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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cumulative Effect of Changes Made to Balance Sheet for Adoption of New Standard (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred contract costs, prepaid expenses and other current assets | $ 21,853 |  | $ 37,772
Total current assets | 160,155 |  | 166,813
Total assets | 177,435 |  | 187,044
Deferred Revenue | 3,947 |  | 7,286
Customer advances | 561 |  | 21,828
Total current liabilities | 69,793 |  | 88,264
Total Liabilities | 75,269 |  | 96,052
Accumulated earnings | (1,212,790) |  | (1,226,173)
Total stockholders' equity | 102,166 |  | 90,992
Total liabilities and stockholders' equity | 177,435 |  | $ 187,044
ASU 2014-09 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred contract costs, prepaid expenses and other current assets |  | $ 27,926 |
Total current assets |  | 156,967 |
Total assets |  | 177,198 |
Deferred Revenue |  | 4,743 |
Customer advances |  | 6,605 |
Total current liabilities |  | 69,855 |
Total Liabilities |  | 77,643 |
Accumulated earnings |  | (1,217,610) |
Total stockholders' equity |  | 99,555 |
Total liabilities and stockholders' equity |  | 177,198 |
ASU 2014-09 | Adjustment Due to Adoption of ASC 606 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Deferred contract costs, prepaid expenses and other current assets | 51,267 | (9,846) |
Total current assets |  | (9,846) |
Total assets |  | (9,846) |
Deferred Revenue | 121 | (2,543) |
Customer advances | (26,021) | (15,223) |
Total current liabilities |  | (18,409) |
Total Liabilities |  | (18,409) |
Accumulated earnings | $ 4,239 | 8,563 |
Total stockholders' equity |  | 8,563 |
Total liabilities and stockholders' equity |  | $ (9,846) |

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