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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2014
INCOME TAXES |
Schedule of significant components of the entity's deferred tax assets |
|  | December 31, |
|  | 2014 |  | 2013 |
|  | (In thousands) |
Net operating loss carryforwards |  | $ | 281,300 |  | $ | 271,800 |
Purchased technology |  |  | — |  |  | 6,300 |
Research credits |  |  | 23,400 |  |  | 22,700 |
Capitalized research and development |  |  | 2,100 |  |  | 6,600 |
License fees |  |  | 500 |  |  | 700 |
Other—net |  |  | 7,600 |  |  | 10,100 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax assets |  |  | 314,900 |  |  | 318,200 |
Valuation allowance for deferred tax assets |  |  | (314,900 | ) |  | (318,200 | )
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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, 2013 |  | $ | 11,600 |
Increase related to prior year tax positions |  |  | 5,100 |
Increase related to current year tax positions |  |  | 400 |
Settlements |  |  | — |
Reductions due to lapse of applicable statute of limitations |  |  | — |
​ | ​ | ​ | ​ | ​
Balance as of December 31, 2014 |  | $ | 17,100 |
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=32707879&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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