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REVENUE - Effect of Adoption of ASC 606 Affect Prior year (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Jul. 01, 2018 | Jun. 30, 2018 | Mar. 31, 2018
--- | --- | --- | --- | --- | --- | ---
ASSETS |  |  |  |  |  |
Prepaid expenses and other current assets | $ 2,878 |  |  | $ 1,180 | $ 929 | $ 1,278
Other assets | 1,922 |  |  | 1,974 | 720 | 414
LIABILITIES |  |  |  |  |  |
Deferred revenue | 1,322 | $ 1,437 |  | 1,638 | 511 | 511
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit | (253,859) |  |  | (232,372) | (232,748) | $ (231,052)
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Prepaid expenses and other current assets | 2,615 |  |  |  | 929 |
Other assets |  |  |  |  | 720 |
LIABILITIES |  |  |  |  |  |
Deferred revenue |  |  | $ 1,437 |  | 511 |
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit | (254,427) |  |  |  | $ (232,748) |
Adjustment | ASC 606 |  |  |  |  |  |
ASSETS |  |  |  |  |  |
Prepaid expenses and other current assets | (263) |  |  | 251 |  |
Other assets |  |  |  | 1,254 |  |
LIABILITIES |  |  |  |  |  |
Deferred revenue |  | $ 0 |  | 1,127 |  |
SHAREHOLDERS' EQUITY |  |  |  |  |  |
Accumulated deficit | $ (568) |  |  | $ 376 |  |

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