v3.19.1

Geographic Information - Additional Information (Detail) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets | $ 13,691,000 | $ 22,452,000
Argentina [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets | 4,269,000 | $ 2,441,000
Dominican Republic [Member] |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |
Assets | $ 1,734,000 |

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