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Derivative Instruments - Additional Information (Detail) - USD ($) | 9 Months Ended |
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Sep. 30, 2019 | Dec. 31, 2018
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Derivative notional amount | $ 35,857,965 | $ 28,870,081
Minimum [Member] |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Derivative foreign currency exchange contracts durations | 1 month |
Maximum [Member] |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Derivative foreign currency exchange contracts durations | 3 months |

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