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Restructuring and Severance - Additional Information (Detail) - USD ($) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Restructuring Cost And Reserve [Line Items] |  |
Restructuring and severance expenses | $ 65,000 | $ (12,000)
Sublease income received | 200,000 |
3VR |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring and severance expenses | 65,000 |
3VR | Facility Rental |  |
Restructuring Cost And Reserve [Line Items] |  |
Sublease income received | 190,000 |
3VR | Severance |  |
Restructuring Cost And Reserve [Line Items] |  |
Restructuring and severance expenses | $ 64,000 |

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