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Lease Agreements - Sublease Agreements (Details) $ in Thousands |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 36 Months Ended
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Dec. 18, 2019 USD ($) item | Oct. 24, 2018 facility | May 01, 2018 USD ($) facility | Dec. 26, 2017 USD ($) facility | Jan. 31, 2019 USD ($) facility | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 17, 2019 facility | Dec. 31, 2018 USD ($) | Dec. 31, 2016 facility | Dec. 31, 2019 item
Leased facilities, Berkeley, California |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |
Number of operating leases terminated early | item | 2 |  |  |  |  |  |  |  |  |  |
Lease termination loss | $ 400 |  |  |  |  |  | $ 400 |  |  |  |
Operating leases, number of subtenants | item |  |  |  |  |  |  |  |  |  |  | 4
Operating leases, number of leased facilities | facility |  | 3 | 3 | 3 | 3 |  |  | 2 |  | 2 |
Sublease loss |  |  |  |  |  | $ 600 |  |  |  |  |
Portion of leased facilities, Berkeley, California, subleased December 26, 2017 |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |
Number of facilities for which a portion was subleased | facility |  |  |  | 1 |  |  |  |  |  |  |
Subtenant improvement allowance provided to subtenant |  |  |  | $ 800 |  |  |  |  |  |  |
Amount of security provided by sub-lessee |  |  |  | $ 1,000 |  |  |  |  |  |  |
Sublease income, 2019 |  |  |  |  |  |  | 1,400 |  |  |  |
Sublease income, 2018 |  |  |  |  |  |  |  |  | $ 1,500 |  |
Portion of leased facilities, Berkeley, California, subleased May 1, 2018 |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |
Number of facilities for which a portion was subleased | facility |  |  | 1 |  |  |  |  |  |  |  |
Subtenant improvement allowance provided to subtenant |  |  | $ 65 |  |  |  |  |  |  |  |
Sublease broker commissions |  |  | 89 |  |  |  |  |  |  |  |
Sublease loss |  |  | $ 600 |  |  |  |  |  |  |  |
Sublease income, 2019 |  |  |  |  |  |  | 400 |  |  |  |
Sublease income, 2018 |  |  |  |  |  |  |  |  | 300 |  |
Portion of leased facilities, Berkeley, California, subleased October 24, 2018 |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |
Number of facilities for which a portion was subleased | facility |  | 1 |  |  |  |  |  |  |  |  |
Sublease income, 2019 |  |  |  |  |  |  | 600 |  |  |  |
Sublease income, 2018 |  |  |  |  |  |  |  |  | $ 100 |  |
Portion of leased facilities, Berkeley, California, subleased January 18, 2019 |  |  |  |  |  |  |  |  |  |  |
Leases |  |  |  |  |  |  |  |  |  |  |
Number of facilities for which a portion was subleased | facility |  |  |  |  | 1 |  |  |  |  |  |
Subtenant improvement allowance provided to subtenant |  |  |  |  | $ 91 |  |  |  |  |  |
Sublease broker commissions |  |  |  |  | $ 53 |  |  |  |  |  |
Sublease income, 2019 |  |  |  |  |  |  | $ 600 |  |  |  |

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- Definition Amount of sublease income excluding finance and operating lease expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 + Details
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