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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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