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v3.20.1

Restructuring Charges (Details) $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 24, 2018 facility | May 01, 2018 facility | Dec. 26, 2017 facility | Jan. 31, 2019 facility | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 17, 2019 facility | Dec. 31, 2018 USD ($) | Dec. 31, 2016 facility | Dec. 31, 2017 employee
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Restructuring liability, current |  |  |  |  | $ 84 |  |  |  |  | $ 84 |  |
Restructuring |  |  |  |  | 543 | $ 909 | $ 459 |  |  | 1,911 |  |
Leased facilities, Berkeley, California |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Operating leases, number of leased facilities | facility | 3 | 3 | 3 | 3 |  |  |  |  | 2 |  | 2 |
Sublease loss |  |  |  |  |  |  | $ 600 |  |  |  |  |
Lease-related Costs |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  | $ 0 |  |  |  |
Lease-related Costs | Accrued and other liabilities |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Restructuring liability, current |  |  |  |  | 1,400 |  |  |  |  | 1,400 |  |
Lease-related Costs | Other liabilities, Non-current |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Restructuring liability, noncurrent |  |  |  |  | $ 300 |  |  |  |  | 300 |  |
2017 and 2016 Restructuring |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Number of employees terminated | employee |  |  |  |  |  |  |  |  |  |  |  | 62
2017 and 2016 Restructuring | Lease-related Costs |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Charges |  |  |  |  |  |  |  |  |  |  |  |
Restructuring |  |  |  |  |  |  |  |  |  | $ 1,900 |  |

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