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Restructuring - Additional Information (Detail) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 USD ($) | May 23, 2019 Position | Sep. 30, 2019 USD ($) | Sep. 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
Restructuring charges |  |  | $ 3,937 | $ 12,714
Restructuring and related costs incurred | $ 13,400 |  |  |
Accelerated depreciation charges |  |  | $ 3,000 | 3,000
Severance and Other Termination Benefits |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | 5,600
Stock-Based Compensation Expense |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |
Restructuring charges |  |  |  | $ 4,100

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