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Deferred Revenue	6 Months Ended
Deferred Revenue	Jun. 30, 2018
DEFERRED REVENUE
DEFERRED REVENUE	11. DEFERRED REVENUE Deferred revenue relates to a prepayment for future royalties on sales of SPEDRA. In the three and six months ended June 30, 2018, the Company recorded $0.3 million and $0.6 million, respectively, of revenues which had been deferred as of December 31, 2017.