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RELATED PARTY TRANSACTIONS
9 Months Ended
Sep. 30, 2019
Related Party Transactions [Abstract]  
RELATED PARTY TRANSACTIONS RELATED PARTY TRANSACTIONSThe Company leases a portion of its corporate headquarters in San Diego, California to entities 100% owned by the Company’s Chairman and Chief Executive Officer. Rental income recorded for the three and nine months ended September 30, 2019 and 2018 totaled $4,000 and $6,000, respectively, and $7,000 and $21,000, respectively.