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INCOME TAXES (Tables)

12 Months Ended

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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- References

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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=65882285&loc=d3e32537-109319

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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=75116239&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=65882285&loc=SL6600010-109319

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