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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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Date the exit and disposal activities were completed or are expected to be completed, in CCYY-MM-DD format.

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Discloses the amount charged against the accrued restructuring reserves, or earnings if not previously accrued, during the period for the specified type of restructuring cost.

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The number of positions eliminated during the period as a result of restructuring activities.

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The number of positions eliminated during the period as a percentage of total positions eliminated during the period in connection with the restructuring plan(s).

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