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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2015
INCOME TAXES |
Schedule of significant components of the entity's deferred tax assets |
|  | December 31, |
|  | 2015 |  | 2014 |
|  | (In thousands) |
Net operating loss carryforwards |  | $ | 276,100 |  | $ | 281,300 |
Research credits |  |  | 25,000 |  |  | 23,400 |
Capitalized research and development |  |  | 1,400 |  |  | 2,100 |
License fees |  |  | 300 |  |  | 500 |
Other—net |  |  | 9,800 |  |  | 7,600 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax assets |  |  | 312,600 |  |  | 314,900 |
Valuation allowance for deferred tax assets |  |  | (312,600 | ) |  | (314,900 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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, 2014 |  | $ | 17,100 |
Increase related to prior year tax positions |  |  | 2,300 |
Increase related to current year tax positions |  |  | 700 |
Settlements |  |  | — |
Reductions due to lapse of applicable statute of limitations |  |  | — |
​ | ​ | ​ | ​ | ​
Balance as of December 31, 2015 |  | $ | 20,100 |
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