Anti-dilutive Security not Included In Diluted per Share Calculations (Parenthetical) (Detail) - shares |
12 Months Ended | |
---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Preferred stock, shares outstanding | 3,680 | 0 |
Conversion of preferred stock to common stock | 3,346,332 | 293,796 |
Series A Preferred Stock | ||
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
Preferred stock, shares outstanding | 3,680 | |
Conversion of preferred stock to common stock | 700,000 |