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Lease Obligations | 12 Months Ended
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Dec. 31, 2018
Leases [Abstract] |
Lease Obligations | Lease Obligations We lease office facilities under various operating leases. These leases expire between 2019 and 2023. Total rent expense, net under all office leases for 2018, 2017 and 2016 was $1.0 million, $0.3 million and $0.3 million, respectively. 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 years |  | 3-4 years |  | Total
Corporate headquarters - San Diego, CA |  | April 2023 |  | $ | 135 |  | $ | 283 |  | $ | 198 |  | $ | 616
Office and research facility - La Jolla, CA |  | June 2019 |  | 373 |  | — |  | — |  | 373
Bioscience and Technology Business Center - Lawrence, KS |  | December 2020 |  | 57 |  | 56 |  | — |  | 113
Office - Emeryville, CA |  | August 2021 |  | 260 |  | 455 |  | — |  | 715
Research Facility - Emeryville, CA |  | August 2021 |  | 203 |  | 351 |  | — |  | $ | 554
Office - Winnersh, United Kingdom |  | April 2019 |  | 43 |  | — |  | — |  | 43
Research Facility - Cambridge, United Kingdom |  | September 2019 |  | 549 |  | — |  | — |  | 549
Total operating lease obligations |  |  |  | $ | 1,620 |  | $ | 1,145 |  | $ | 198 |  | $ | 2,963
Sublease payments expected to be received: |  |  |  |  |  |  |  |  |  |
Office and research facility - La Jolla, CA |  | June 2019 |  | 360 |  | — |  | — |  | 360
Net operating lease obligations |  |  |  | $ | 1,260 |  | $ | 1,145 |  | $ | 198 |  | $ | 2,603

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=77888251 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -URI http://asc.fasb.org/topic&trid=2208923 + Details
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