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Restructuring - Additional Information (Detail) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 23, 2019 Position | Jan. 31, 2017 | Mar. 31, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2017 USD ($)
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Number of positions reduced in global workforce | Position | 80 |  |  |  |
Percentage of reduction in global workforce | 36.00% | 40.00% |  |  |
Restructuring completion date |  |  |  | Dec. 31, 2019 |
Restructuring |  |  |  | $ 13,356 | $ 2,783
Employee Severance and Other Benefits |  |  |  |  |
Restructuring Cost And Reserve [Line Items] |  |  |  |  |
Restructuring |  |  | $ 2,800 | 6,277 |
Cash payments |  |  |  | $ 5,602 | $ 2,800

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