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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2016
INCOME TAXES |
Schedule of significant components of the entity's deferred tax assets |
|  | December 31, |
|  | 2016 |  | 2015 |
|  | (In thousands) |
Net operating loss carryforwards |  | $ | 280,400 |  | $ | 276,100 |
Research credits |  |  | 29,800 |  |  | 25,000 |
Capitalized research and development |  |  | 300 |  |  | 1,400 |
License fees |  |  | 200 |  |  | 300 |
Other—net |  |  | 11,500 |  |  | 9,800 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax assets |  |  | 322,200 |  |  | 312,600 |
Valuation allowance for deferred tax assets |  |  | (322,200 | ) |  | (312,600 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net deferred tax assets |  | $ | — |  | $ | — |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of reconciliation of the beginning and ending amounts of unrecognized tax benefits | A reconciliation of the beginning and ending amounts of unrecognized tax benefits is as follows (in thousands):
Balance as of December 31, 2015 |  | $ | 20,100 |
Decrease related to prior year tax positions |  |  | (7,500 | )
Increase related to current year tax positions |  |  | 2,100 |
​ | ​ | ​ | ​ | ​
Balance as of December 31, 2016 |  | $ | 14,700 |
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