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Stockholder's Equity - Schedule of Transaction Related to Warrants to Purchase Common Stock (Detail) - $ / shares
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Stockholders Equity [Abstract]        
Warrants outstanding and exercisable beginning balance, Shares   347,241 347,241  
Warrants granted, Shares 0   40,834  
Warrants exercised, Shares 0 (59,707) (59,707)  
Warrants forfeited, Shares 0   (4,474)  
Warrants outstanding and exercisable ending balance, Shares 323,894   323,894 347,241
Warrants outstanding and exercisable beginning balance, Weighted average exercise price   $ 3.77 $ 3.77  
Warrants granted, Weighted average exercise price     11.02  
Warrants exercised, Weighted average exercise price   $ 3.01 3.01  
Warrants forfeited, Weighted average exercise price     40.00  
Warrants outstanding and exercisable ending balance, Weighted average exercise price $ 4.32   $ 4.32 $ 3.77
Warrants outstanding and exercisable Weighted average remaining contractual life     3 years 11 months 26 days 3 years 11 months 1 day
Warrants granted, Weighted average remaining contractual life     10 years