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RELATED PARTY TRANSACTIONS	9 Months Ended
RELATED PARTY TRANSACTIONS	Mar. 31, 2019
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS We are party to Drug Discovery Collaboration Option Agreements, as amended, with Mirati pursuant to which we provide certain drug discovery and research activities to Mirati pursuant to which we have received upfront payments, license fees, milestone payments and reimbursement for research and development services and under which we are entitled to receive additional milestone payments based on achievement of certain milestones, as described in Note 4 - Collaboration and Other Agreements. Dr. Charles Baum, a current member of our Board of Directors, is the President and Chief Executive Officer of Mirati.