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Exchange Agreements - Summary of Income Statement Effect of Changes in Outstanding Warrants (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Class of Warrant or Right [Line Items]    
Gain on warrants exchanged Q3 2018   $ 779,923
Common Stock Warrants [Member]    
Class of Warrant or Right [Line Items]    
Changes in fair value of warrants $ 82,466 (5,160)
Loss on warrants exchanged Q2 2018   (3,467,935)
Gain on warrants exchanged Q3 2018 779,923 779,923
Transaction Costs (56,165) (181,312)
Change in fair value of warrant liability, including gain (loss) on exchange $ 806,224 $ (2,874,484)