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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Current deferred tax assets |  |  |
Deferred revenue | $ 0 | $ 0 | $ 948
Inventories | 2,900 | 1,415 | 1,677
Short-term investments | 413 | 408 | 188
Total current deferred tax assets | 3,313 | 1,823 | 2,813
Non-current deferred tax assets |  |  |
Operating loss carry forwards | 91,441 | 86,807 | 60,012
Capital loss carry forwards | 21,322 | 21,297 | 21,507
Deferred revenue and other | 3,885 | 3,987 | 1,719
Mineral properties and deferred costs | 40,581 | 41,631 | 23,632
Asset retirement obligations | 6,398 | 3,226 | 2,138
Intangibles and other | (2,524) | (3,772) | (2,134)
Property, plant and equipment | (751) | (1,348) | 9,547
Total non-current deferred tax assets | 160,352 | 151,828 | 116,421
Subtotal deferred tax asset | 163,665 | 153,651 | 119,234
Less: valuation allowance | (163,665) | (153,651) | (119,234)
Net deferred tax asset | $ 0 | $ 0 | $ 0

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