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Commitments and Contingencies (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
Future minimum lease payments under non-cancelable operating leases |  |  |  |  |
2017 | $ 539 |  | $ 539 |  |
2018 | 2,121 |  | 2,121 |  |
2019 | 2,227 |  | 2,227 |  |
2020 | 2,332 |  | 2,332 |  |
2021 | 2,401 |  | 2,401 |  |
Thereafter | 11,856 |  | 11,856 |  |
Total minimum lease payments | 21,476 |  | 21,476 |  |
Facilities rent expense | 469 | $ 457 | $ 1,400 | $ 1,500 |
Headquarters and laboratory facilities, South San Francisco, Lease signed April 2015 |  |  |  |  |
Operating Leases |  |  |  |  |
Amount of space leased | ft² |  |  | 59 |  |
Security deposit | 603 |  | $ 603 |  | $ 603
Laboratory facilities, Austin, Texas | Other assets |  |  |  |  |
Operating Leases |  |  |  |  |
Security deposit | $ 139 |  | $ 139 |  | $ 75

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