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

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

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Amount expected to be recognized in earnings for the specified restructuring cost.

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Amount of expected cost remaining for the specified 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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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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