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Restructuring and Severance - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Feb. 14, 2018	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses		$ (12)	$ 110
Restructuring accrual		$ 129		$ 129
3VR
Restructuring Cost And Reserve [Line Items]
Date of acquisition completed	Feb. 14, 2018	Feb. 14, 2018
3VR | Facility Rental
Restructuring Cost And Reserve [Line Items]
Restructuring and severance expenses		$ 100

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Date when the acquirer obtains control of the acquiree, in CCYY-MM-DD format.

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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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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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