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NON-CURRENT ASSETS	3 Months Ended
NON-CURRENT ASSETS	Mar. 31, 2016
NON-CURRENT ASSETS
NON-CURRENT ASSETS	7. NON-CURRENT ASSETS Non-current assets of $2.4 million and $2.6 million as of March 31, 2016 and December 31, 2015, respectively, consist primarily of patent acquisition and assignment costs.