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Restructuring - Additional Information (Detail) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 23, 2019 Position | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |
Number of positions reduced in global workforce | Position | 80 |  |
Percentage of reduction in global workforce | 36.00% |  |
Restructuring completion date |  |  | Dec. 31, 2019
Estimated restructuring cost |  | $ 9,400 | $ 9,400
Restructuring charges |  | 8,777 | 8,777
Estimated restructuring cost remaining |  | 600 | 600
Employee Severance and Other Benefits |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Estimated restructuring cost |  | $ 5,300 | 5,300
Restructuring charges |  |  | 4,655
Stock-Based Compensation Expense |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |
Restructuring charges |  |  | $ 4,100

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