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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Revenue Recognition: |  |  |
Cumulative increase to retained earnings |  | $ (1,226,173) | $ (1,233,154)
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
Revenue Recognition: |  |  |
Cumulative increase to retained earnings | $ 7,400 |  |
Unearned revenue | 14,400 |  |
Deferred costs | $ 7,000 |  |
UTSTARCOM HOLDINGS CORP |  |  |
Revenue Recognition: |  |  |
Cumulative increase to retained earnings |  | $ (1,226,174) | $ (1,233,154)

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