| Commitments and Contingencies - Future Annual Minimum Payments under all Non-Cancelable Operating Leases (Detail) | Dec. 31, 2018  USD ($) | 
|---|---|
| Commitments And Contingencies Disclosure [Abstract] | |
| 2019 | $ 171,804 | 
| 2020 | 8,784 | 
| Total | $ 180,588 | 
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- References No definition available. 
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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition 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 second 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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