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Restructuring Charges - Additional Information (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 19, 2016 Employee | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) Subtenant | Dec. 31, 2017 USD ($) Employee
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges (credit) |  | $ 543 | $ 909 | $ 459 | $ (4) | $ (29) | $ 1,460 | $ 2,020 |  |
Operating leases, number of subtenants | Subtenant |  |  |  |  |  |  |  |  | 3 |
Lease-related Costs [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges (credit) |  |  |  |  |  |  |  |  | $ 1,300 |
Restructuring liability |  | 1,400 |  |  |  |  |  |  | 1,400 |
Reversal of deferred rent liability |  | 700 |  |  |  |  |  |  | 700 |
Lease-related Costs [Member] | Accrued and Other Liabilities [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Combined lease-related liabilities, current portion |  | 1,400 |  |  |  |  |  |  | 1,400 |
Lease-related Costs [Member] | Other Liabilities Non-current [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Combined lease-related liabilities, non-current portion |  | $ 300 |  |  |  |  |  |  | $ 300 |
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
2017 and 2016 Restructuring [Member] | Severance, Other Termination Benefits and Outplacement Services [Member] |  |  |  |  |  |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring charges (credit) |  |  |  |  |  |  |  |  |  | $ 3,400

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