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Stockholders' Equity/(Deficit) - Summary of Common Stock Warrants Outstanding (Detail)
 12 Months Ended
Dec. 31, 2018
$ / shares
shares
Class of Warrant or Right [Line Items]  
Common Stock Warrants 885,625
Class of Warrant One [Member]  
Class of Warrant or Right [Line Items]  
Common Stock Warrants 120,000
Exercise Price | $ / shares $ 3.52
Termination Date Jan. 10, 2021
Class of Warrant Two [Member]  
Class of Warrant or Right [Line Items]  
Common Stock Warrants 65,625
Exercise Price | $ / shares $ 12.00
Termination Date Dec. 07, 2021
Class of Warrant Three [Member]  
Class of Warrant or Right [Line Items]  
Common Stock Warrants 700,000
Exercise Price | $ / shares $ 7.16
Termination Date Feb. 11, 2023