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Facility Lease
 6 Months Ended
Jun. 30, 2017
Leases [Abstract]  
Facility Lease

9.

FACILITY LEASE

The Company leases approximately 68,400 square feet of manufacturing, research laboratory and office space at a single site in San Diego, California.  In July 2016, the term of the lease was extended for 16 months through December 2018, resulting in an additional obligation of $2.9 million.