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v3.19.1

Commitments - Additional Information (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Feb. 28, 2019
Rent expense for office space | $ 659,000 | $ 659,000 |
Subsequent Event [Member] |  |  |
Lease Payments With in One Year |  |  | $ 344,000
Lease Payments Due Next year |  |  | $ 86,000

X
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