Anti-dilutive Security not Included In Diluted per Share Calculations (Detail) - shares |
12 Months Ended | |
---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Anti dilutive securities | 3,346,332 | 293,796 |
Options To Purchase Common Stock | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Anti dilutive securities | 821,741 | 140,990 |
Convertible Preferred Stock | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Anti dilutive securities | 736,000 | |
Common Stock Warrants | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Anti dilutive securities | 1,751,708 | 12,063 |
Redeemable Convertible Notes | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Anti dilutive securities | 36,883 | 140,743 |