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Commitments and Contingencies - Future Principal Payments Under Note Payable (Detail)
Dec. 31, 2017
USD ($)
Long Term Notes Payable [Abstract]  
2018 (remainder of) $ 157,757
2019 223,820
2020 240,258
2021 257,903
2022 276,845
2023 and thereafter 1,326,192
Total $ 2,482,775