Net Loss per Share - Summary of Securities Not Included in Diluted Per Share Calculations (Detail) - shares |
3 Months Ended | |
---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities not included in the diluted per share calculations, amount | 635,199 | 285,860 |
Option to purchase common stock [Member] | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities not included in the diluted per share calculations, amount | 252,554 | 219,015 |
Warrants to purchase common stock [Member] | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Antidilutive securities not included in the diluted per share calculations, amount | 382,645 | 66,845 |