Schedule of Future Minimum Office And Vehicle Lease Payments (Detail) - office and vehicle - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Commitments And Contingencies [Line Items]
2019 (Remainder)	$ 742,078
2020	1,503,192
2021	1,532,458
2022	1,254,828
2023	87,957
Total	$ 5,120,513
2019		$ 1,595,421
2020		1,623,835
2021		1,653,101
2022		1,305,096
2023		87,957
Total		$ 6,265,410

Commitments and Contingencies [Line Items]

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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-SubTopic 20
-Section 50
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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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