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SELECTED QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues	$ 94,000	$ 5,108,000	$ 211,000	$ 749,000	$ 220,000	$ 35,363,000	$ 251,000	$ 537,000	$ 6,162,000	$ 36,371,000	$ 1,153,000
Operating expenses	8,875,000	8,985,000	9,122,000	9,826,000	8,864,000	8,343,000	9,730,000	9,993,000	36,808,000	36,930,000	37,465,000
Net (loss) income	$ (8,482,000)	$ (3,576,000)	$ (8,637,000)	$ (8,842,000)	$ (8,468,000)	$ 27,185,000	$ (9,356,000)	$ (9,315,000)	(29,537,000)	46,000	(35,670,000)
Basic and diluted net (loss) income per share	$ (0.05)	$ (0.02)	$ (0.05)	$ (0.06)	$ (0.05)	$ 0.17	$ (0.06)	$ (0.06)
License fee revenue									$ 6,162,000	1,371,000	$ 1,153,000
Collaboration revenue										$ 35,000,000
Janssen Pharmaceuticals | License agreements
License fee revenue		$ 5,000,000
Janssen Biotech | License agreements
Collaboration revenue						$ 35,000,000

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Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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