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Lease Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Leases [Abstract]  
Schedule of Operating Lease Obligations and Payments Expected to be Received from Sublease Agreements The following table provides a summary of operating lease obligations and payments expected to be received from sublease agreements as of December 31, 2018 (in thousands):
Operating lease obligations:
Lease
Termination
Date
Less than 1
year
1-2 years3-4 yearsTotal
Corporate headquarters - San Diego, CAApril 2023$135 $283 $198 $616 
Office and research facility - La Jolla, CAJune 2019373 — — 373 
Bioscience and Technology Business Center - Lawrence, KSDecember 202057 56 — 113 
Office - Emeryville, CAAugust 2021260 455 — 715 
Research Facility - Emeryville, CAAugust 2021203 351 — $554 
Office - Winnersh, United KingdomApril 201943 — — 43 
Research Facility - Cambridge, United KingdomSeptember 2019549 — — 549 
Total operating lease obligations$1,620 $1,145 $198 $2,963 
Sublease payments expected to be received:
Office and research facility - La Jolla, CAJune 2019360 — — 360 
Net operating lease obligations$1,260 $1,145 $198 $2,603