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Restructuring Charges - Additional Information (Details) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 21, 2017 USD ($) Facility | Dec. 19, 2016 Employee | Jun. 30, 2018 USD ($) Facility | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) Facility Subtenant | Jun. 30, 2017 USD ($) Employee | Apr. 14, 2018 Facility
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Operating leases, number of leased facilities | Facility | 3 |  |  |  |  |  | 3
Operating leases, number of subtenants | Subtenant |  |  |  |  | 2 |  |
Operating leases, loss on sublease | $ 800 |  |  |  |  |  |
Restructuring credit |  |  | $ 459 | $ 1,460 | $ 459 | $ 3,480 |
Restructuring Charges [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Operating leases, loss on sublease |  |  | 600 |  | 600 |  |
Lease-related Costs [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Restructuring credit |  |  | 100 |  | 100 |  |
Restructuring liability |  |  | 400 |  | 400 |  |
Reversal of deferred rent liability |  |  |  |  | 600 |  |
Lease-related Costs [Member] | Accrued and Other Liabilities [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Combined lease-related liabilities, current portion |  |  | 400 |  | 400 |  |
Lease-related Costs [Member] | Other Liabilities Non-current [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Combined lease-related liabilities, non-current portion |  |  | $ 500 |  | $ 500 |  |
Berkeley, California [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Operating leases, number of leased facilities | Facility |  |  | 2 |  | 2 |  |
Operating leases, number of leased facilities vacated | Facility |  |  |  |  | 1 |  |
2016 Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Number of employees terminated | Employee |  | 57 |  |  |  |  |
2017 Restructuring [Member] |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |
Number of employees terminated | Employee |  |  |  |  |  | 5 |

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