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RESTATEMENT OF CONSOLIDATED FINANCIAL STATEMENTS - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ (264,400) | $ (232,372) | $ (232,748) | $ (231,052) | $ (227,829) | $ (223,635) | $ (221,531) | $ (218,593) | $ (217,668) | $ (217,436) |
Decrease in deferred income taxes |  |  |  |  |  |  |  |  |  |  | $ (2,300)
Adjustments |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | $ (36,191) | $ (31,808) | $ (40,130) | $ (38,172) | $ (34,991) | $ (33,930) | $ (33,465) | (32,600)
Decrease in deferred income taxes |  |  |  |  |  |  |  |  |  |  | $ 27,800

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